Model Engine Maker

Engines => Restoration of Model Engines => Topic started by: Stilldrillin on October 25, 2014, 03:24:16 PM

Title: Scott Vacuum Engine......
Post by: Stilldrillin on October 25, 2014, 03:24:16 PM

Introducing Scott. Another of my orphan engines.

Arrived a couple of years ago. Been patiently waiting in the cupboard.  :-\

Never run. (I don't think)........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/P1040525_zpsdcaa545b.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/P1040525_zpsdcaa545b.jpg.html)


Badly packed, on top of the wad of drawings. Which were penetrated by the crankshaft.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/P1040537_zps0331356d.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/P1040537_zps0331356d.jpg.html)


The shaft was bent, and flywheel distorted.
Rather proud of myself, at the time. I made a ballrace nudger. Which got it back, to within a couple of thou'.  ;)

As it arrived. It was impossible to screw the valve mechanism together, tight enough........  :facepalm2:

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/P1040535_zps89ff6618.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/P1040535_zps89ff6618.jpg.html)


I dimpled the cross shaft, for the grub screw. Then made a temporary return spring........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/P1040529_zps088fa15a.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/P1040529_zps088fa15a.jpg.html)


No joy! The shutter arrangement is much too light n floppy. Had a few pops, only.

After I'd caught my finger in the guillotine, for the third time. I decided it was time for some mods.......  :)

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/P1040533_zps4a5a9bc6.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/P1040533_zps4a5a9bc6.jpg.html)


So......

The engine part is fine. The valve part is 'orrible.

I need some info, as to which is the best system to get the flame safely into the cylinder, at the correct time.

Some systems are eccentric driven, rather than a cam. I guess that is for quicker open/ close action.
But an eccentric will give positive motion, in both directions.

I can visualise a push/pull or twisting rod, along the side. How does it turn the corner, to the port?

Anyone any ideas? Crap o cad/ pics/ vids, gratefully accepted.

David D
Title: Re: Scott Vacuum Engine......
Post by: Jasonb on October 25, 2014, 04:36:07 PM
John (Bogstandard) did quite a detailed build of this and the alterations to the springs and block that were needed to get it to run. May have been on Here, Madmodder or HMEM but not sure if teh imahes will still be in the thread.

Failing that he does post a bit on ME Forum so may spot a thread there is you start one
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on October 25, 2014, 04:48:46 PM
Thanks for that, Jason.  :ThumbsUp:

It's here.... http://www.modelenginemaker.com/index.php/topic,158.0.html

I also followed his build, in real time, on Modder........

Frankly, (you know me)...... I want to completely change the valve mechanism.  :facepalm2:

To something more reliable.  :D

David D
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on October 25, 2014, 05:21:43 PM
Maybe a face cam and a side shaft arrangement :mischief:
That will get rid of the awful valve set up.
http://www.vakuum-und-heisse-gase.de/StartseiteVakuummotoren.html  :ThumbsUp: :ThumbsUp:
Probably telling me granny how to suck eggs .You want about 110 to 120 degrees of valve duration and fast lift n close ramp
Cheers marra
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on October 28, 2014, 09:15:31 AM
Well, Frazer.......

It looks like it's just me an you. Who are barmy enough, to struggle with these crazy machines.  :ShakeHead:

That's a great site! Many good ideas. (Once I'd found the arrow, down the bottom of the page).  :embarassed:

Would be even better, if I could read it in English. (I guess/ hope, someone will know how).  :headscratch:

Frankly, I like the Bengs Nick, system, on the engine I've just recycled. I'm exploring possibilities for a copy version.......  ;)

David D
Title: Re: Scott Vacuum Engine......
Post by: Bluechip on October 28, 2014, 09:46:55 AM
Well, Frazer.......

It looks like it's just me an you. Who are barmy enough, to struggle with these crazy machines.  :ShakeHead:

10/10.   Can find no fault with that conclusion.    :Lol:

Would be even better, if I could read it in English. (I guess/ hope, someone will know how).  :headscratch:

'Translate with Bing' works here 


Title: Re: Scott Vacuum Engine......
Post by: wagnmkr on October 28, 2014, 11:20:20 AM
Google translate worked for me.

Tom
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on October 28, 2014, 12:53:15 PM
Dave.

Well, ar!  :agree:   :-\


Dave/ Tom.

Thanks Chaps! Both systems seem to do the business. Will peruse deeper, this eve.

At the moment, I'm struggling to press the cylinder out of the hopper casting....... (There's a small coolant leak).  :facepalm:

David D
Title: Re: Scott Vacuum Engine......
Post by: Roger B on October 28, 2014, 05:53:22 PM
If the online translators struggle with some of the technical German I may be able to help.
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on October 28, 2014, 07:44:35 PM
Hi David, yep its a minority sport
Theres far more interest on the continent and some very helpful guys and girls
http://www.bloooo.fr/forums/viewtopic.php?f=31&t=4018&start=15 . One of my favourite sites to browse and some nice builds Iv been looking into an Essex build.
The only prob Iv got is learning French,Dutch and German and Iv never gotten the hang of English
Should be good entertainment
Just had a gleg at that base casting as you rightly say go for the Bengs or Poppin valve idea .Will it be possible to mount a pivot on the lower face of the base casting and an extended pin to run on the cam???
cheers ma dears
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on October 28, 2014, 08:50:07 PM
Roger.
Thanks for the offer! The translation's quirky. But quite sufficient to understand, with pictures......  ;)

Frazer.
Yes. As you say, good entertainment. Or total confusion!   :o

Pivot on the lower face? What's wrong with the existing pivot? Or...... Am I missing something? :headscratch:

It's a bit late now! Roughed out slot.......


(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141028_150957431_zps9f80c258.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141028_150957431_zps9f80c258.jpg.html)

David D
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on October 28, 2014, 11:22:40 PM
Hi David, no problems with that slot. Theres more than one way to skin a cat
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on November 07, 2014, 09:16:13 PM
Progressing. Slowly........  ::)

Milled a matching slot, and 4 retaining holes, in the hopper........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141030_115740497_HDR_zps6c3429f5.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141030_115740497_HDR_zps6c3429f5.jpg.html)


Matched up, nicely........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141030_150126407_HDR_zpsfa729aab.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141030_150126407_HDR_zpsfa729aab.jpg.html)


It needed a widget...... M3 thread in one end, 3/16" hole in the other, and a 9degree bend in between.

Turned the big end, and tapped m3. Held in the rotary table, at 9*, spot faced and drilled 3/16 to centre.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141106_112237601_zpsd1e32f4e.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141106_112237601_zpsd1e32f4e.jpg.html)


On to a 3/16" mandrel. Turn small dia........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141106_114512997_HDR_zpsab51b24b.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141106_114512997_HDR_zpsab51b24b.jpg.html)


M3 studding. Turn radius........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141106_115457251_HDR_zps5268d833.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141106_115457251_HDR_zps5268d833.jpg.html)


Couple of flats. Loctited, to the tubular operating arm........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141106_145150649_zps93a4dc13.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141106_145150649_zps93a4dc13.jpg.html)


Bottom of stroke.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141106_144925712_zpsa26d2cf1.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141106_144925712_zpsa26d2cf1.jpg.html)


Top.........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141106_144951748_zpsea4bff60.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141106_144951748_zpsea4bff60.jpg.html)


I'm quite pleased, how it's gone together, so far.

I've (finally), read up the Poppin plans, and think the lightweight valve is the way to go.
Bought some 5thou steel shim. If I can cut it, and keep it flat. I might be in with a chance!

The present return spring is much too stiff. I've made a better action, with a small coil spring, under the cam arm.
But, I don't want to abandon the leaf spring, just yet.

Does anyone know where I can get a sensible length, of 1/4" x .012" spring steel?

Thanks for looking in!  :cheers:

David D
Title: Re: Scott Vacuum Engine......
Post by: Jonfb64 on November 07, 2014, 09:47:25 PM
The coil spring in a tape measure is a preaty handy piece of spring steel. Hope that may be of use to you.

cheers Jon
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on November 07, 2014, 10:43:32 PM
The coil spring in a tape measure is a preaty handy piece of spring steel. Hope that may be of use to you.

cheers Jon

That's a great idea, Jon!  :whoohoo:   Thank you!  :ThumbsUp:

Now..... Where do all the old tapes go to?  :headscratch:

David D
Title: Re: Scott Vacuum Engine......
Post by: PJW on November 08, 2014, 09:19:36 AM
Hi I have been following the log & I need a coil spring for my little Kickstart, steel tape, thanks :cartwheel:
Title: Re: Scott Vacuum Engine......
Post by: AussieJimG on November 08, 2014, 09:43:26 AM
Your projects are always interesting David, and this one is no exception.

Jim
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on November 08, 2014, 11:57:03 AM
Hi David, nice going :ThumbsUp:
For the valve I normally just use feeler gauge as in the ones we used to set points with or the tappets .
May not be large enough for youre engine. Just make a little punch and block to make the hole a bit like the toolmakers shim punch blocks or trap it between two bits of scrap to drill the hole.Telling me granny how to suck eggs :Lol:
It maybe beneficial to knife edge the back of the flame hole as per poppin it does seem to help.
Oh well back to my conundrum Iv dug a hole :censored: :hammerbash:
cheers
Title: Re: Scott Vacuum Engine......
Post by: Steamer5 on November 08, 2014, 07:55:30 PM
Hi David,
 Another rescue operation, well done! And another interesting "how to fix it".

Had a friend who was into clock making who was also in need of a spring like you are hunting for used a feeler gauge, he hunted for a while & found a set that would of been 100 plus mm long....its been some years & hes no longer around. Maybe be worth a look

Cheers Kerrin
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on November 08, 2014, 08:54:06 PM
Your projects are always interesting David, and this one is no exception.
Jim

Thank you, Jim!  :ThumbsUp:

It's nice to know you're out there again. Supporting, as usual......  ;)

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on November 08, 2014, 09:03:06 PM
Hi David, nice going :ThumbsUp:
For the valve I normally just use feeler gauge as in the ones we used to set points with or the tappets .
May not be large enough for youre engine. Just make a little punch and block to make the hole a bit like the toolmakers shim punch blocks or trap it between two bits of scrap to drill the hole.Telling me granny how to suck eggs :Lol:
It maybe beneficial to knife edge the back of the flame hole as per poppin it does seem to help.
Oh well back to my conundrum Iv dug a hole :censored: :hammerbash:
cheers

Hi Frazer.

The slot is 22mm wide. But, I've got plenty of shim, to practice with......  ;)

Just keep on telling (reminding), granny. This old un, needs a nudge, now and again.  ::)

I am planning to chamfer the slot. Should be "fun", with a ball end cutter.

Good luck, with your conundrum. I'll stick with this one, for now. :ThumbsUp:

David.
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on November 08, 2014, 09:10:06 PM
Hi David,
 Another rescue operation, well done! And another interesting "how to fix it".

Had a friend who was into clock making who was also in need of a spring like you are hunting for used a feeler gauge, he hunted for a while & found a set that would of been 100 plus mm long....its been some years & hes no longer around. Maybe be worth a look

Cheers Kerrin

Hi Kerrin.
Thanks for your kind comment. Also, for the feeler gauge tip.  :ThumbsUp:

I've had a veritable chorus of members, from two forums. All with the same idea.
Why didn't it occur to me?  :embarassed:

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on November 09, 2014, 09:19:14 AM
Jon.
The available tape return springs, measure up at only 2 thou thick. Handy to remember, though. Thanks for the tip!  :ThumbsUp:


Feeler gauges....... Hmmm.....  :thinking:
Not given them a thought, for the past 20 years, or so. No need, for modern vehicles.  :shrug:

Just been rummaging, in my old toolboxes........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141109_083004240_zps39ebb0b7.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141109_083004240_zps39ebb0b7.jpg.html)


What a trip, down memory lane!  ^-^

The central one. For my first motorbike. Came from the Brighouse branch of Woolworths, 1960. Cost 1s 3d.

The lower one was bought for my brand new, 1965 BSA Lightning.

The top one, when I went metric. Around 1980.

I've got all the spring steel I need...... Thanks for the posts, and pm's Fellas! Much appreciated.  :cheers:

David D
Title: Re: Scott Vacuum Engine......
Post by: Jo on November 09, 2014, 09:51:44 AM
The lower one was bought for my brand new, 1965 BSA Lightning  :Love:  :Love:

Mine wasn't new when I had it, as you may have guessed you brought yours before I was born  ;)

Jo

Title: Re: Scott Vacuum Engine......
Post by: fcheslop on November 09, 2014, 03:57:45 PM
Oh David, my sympathies thats on big confession an A65 :embarassed: :facepalm2: at least it wasnt the Barracuda or Spitty.
My last new brit was a T140v 1977 what a bit of junk :facepalm: blew up 10 miles from the dealers.
Small wonder youre good at fixing the orphans :Jester:
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on November 10, 2014, 09:04:37 AM
Small wonder youre good at fixing the orphans :Jester:

Frazer.
Many a true word........  ::)

Bought, when Jo was merely a twinkle. I've never since, owned a worse collection, of of poorly designed/ mis matched/ badly assembled parts.
I still have the l/h piston, with it's detached crown. Very memorable ride home from the Yorkshire Dales on one cylinder, and a close ratio gearbox.........  :ShakeHead:

Whoever got it, after my 2 years ownership, got a good un.
To me, it was a waste of a hard earned £341 12s 3d. I never bought another new vehicle, until last year.......  ;)

David D
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on November 10, 2014, 03:38:47 PM
Ah hindsight is a great thing.I had two A50s and always wished Id kept my A7s.
Although Im still not cured as there's still a couple languishing in the garage :lolb: ones even a BSA although Im getting to old and fat for the drops maybe time to put it into touring trim and buy one of those leccy start kits :naughty:
Now Jo as a twinkle I can handle. Its the Tu Tu guys that worry me :mischief:
cheers
Title: Re: Scott Vacuum Engine......
Post by: Jo on November 10, 2014, 05:11:50 PM
Now Jo as a twinkle I can handle.  :o

Are you sure  :LittleDevil:

Jo
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on November 10, 2014, 06:02:41 PM
Managed a few workshop minutes, this afternoon.  :)

Assembled. Then realised, I'd forgotten the leaf spring!  :facepalm:

The little coil spring, saved the day.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141110_153917766_zps6d4fdd51.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141110_153917766_zps6d4fdd51.jpg.html)


Gave it a flick....... And it stuttered into life!!.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141110_151615909_zps2a7ca787.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141110_151615909_zps2a7ca787.jpg.html)


You know that supreme moment.  :whoohoo: 
When the blood pressure goes sky high. And, all you want to do, is dance about, for joy.  :pinkelephant: :pinkelephant:

It's A RUNNER!!!!   :cartwheel: :cartwheel: :cartwheel:


Well...... SOMEONE, was knocking on the door........ "Grandad"....... I nearly burst!  O:-)


I had a Little Helper, for the rest of the afternoon.......

https://www.youtube.com/watch?v=ahN_-4pIVDc


I bet Steven Spielberg, never had such a helper.......

https://www.youtube.com/watch?v=CML7EN2XX1c


Love it! (http://serve.mysmiley.net/love/love0001.gif) (http://www.blueislandsdiving.com)

David D
Title: Re: Scott Vacuum Engine......
Post by: Roger B on November 10, 2014, 06:55:36 PM
 :ThumbsUp:  :ThumbsUp:  :ThumbsUp: What more can I say  :)
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on November 10, 2014, 10:46:45 PM
Nice one David :ROFL:
Dont know whats more entertaining the engine or the granddaughter  :ROFL:
Its nice as they get a little older and there mothers complain.Then I always simply say and who do they take after :naughty:
Not that I encourage them :mischief: or feed them Es or Bs or Iron Brew   :mischief:
Our granddaughter is now eleventeen  :censored:
Cheers and thanks as its cheered this grump up no end
Title: Re: Scott Vacuum Engine......
Post by: PJW on November 11, 2014, 12:04:59 PM
Nice one dave, glad to see it going!
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on November 12, 2014, 09:21:14 AM
Thanks Frazer, Peter.  :ThumbsUp:


So much for the "wonderful" idea, of the original graphite valve, lubricating the piston and bore. No need for other lubrication! :noidea:

The vacuum chamber condensation, turned to rust, overnight!  (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif) (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)

Another, fun d mental flaw? I seem to get a lot of them, in my rebuilds! Sheesh!  :facepalm:


Anyone know, where I can source 35mm dia graphite in the UK. At sensible cost?  :shrug:

David D
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on November 12, 2014, 05:37:48 PM
I know youre a Yorkish shire man and I havna checked the price but can recommend Noggin ends graphity stuff its very good quality and I never had a prob with it unlike that jewellers stirring rubbish
Or maybe more appealing is there no toolies down youre way using edm machines you maybe just be able to snaffle a bit if you give it the hard up pensioner routine  :o
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on November 12, 2014, 06:23:05 PM
Yorkshire, Frazer?!! :hellno:   :cussing: ........ I'll see you, later......  :Argue:

Don't mind paying. Sensibly...... Noggin's sizes only go up to 1" dia.  ::)

Never come across, an edm machine......  :ShakeHead:

Today, I modded the shutter set up, slightly. Had it running at around 150rpm. Until the condensation built up.  :(
Guess that's why I've heard of starting 'em, full of warm water.......  :thinking:

David D

Title: Re: Scott Vacuum Engine......
Post by: fcheslop on November 12, 2014, 07:34:47 PM
Sorry I forget and you know Iv to wiggle under the fences at customs .Not a pretty sight  :ShakeHead:
EDM= sparker
Would a bit of bronze no do :o second mortgage maybe needed.
She is coming on canny soooooo the big question :Jester:
cheers
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on November 15, 2014, 01:42:24 PM
Showing the original "Poppin", shim valve arrangement. It's a bit vulnerable........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141111_113130293_HDR_zps69826932.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141111_113130293_HDR_zps69826932.jpg.html)


So, I made a temporary guide arrangement. Shim, loose on the actuating arm.........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141115_130417515_zps897a27b6.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141115_130417515_zps897a27b6.jpg.html)



No chance, so far, of a piece of graphite.  :(
I thought this would do the job..... http://www.ebay.co.uk/itm/300839376964?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Until I ran the mouse over, to zoom. It's made of dried leafmold!   :o

Guess it will have to be a brass piston.  (http://smileys.on-my-web.com/repository/Others/others-221.gif)

The stainless tube has arrived, to sleeve the cylinder. See last pic.

A piece of 8mm stainless plate is on it's way, for the port face.

Progressing. Slowly......   ;)

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on November 26, 2014, 01:12:39 PM
Progressing, steadily.

The runs I managed to film, were the only life I could coax out of this engine!
Days after, it still hadn't run again.  :shrug:

Condensation left a dragging film, between piston and bore. Couldn't get the engine to spin.
Also, all other internal cast iron areas had a film of rust. (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)

Seems a pity, to break up this well matched partnership. But, it's time to go, rustless!

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141120_094240588_zps5abe358b.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141120_094240588_zps5abe358b.jpg.html)


Bought a length of 35mm stainless steel exhaust, 1.5mm wall thickness.
The inner seam was some 8thou deep. So, I set it over in the chuck jaws, using a piece of 10 thou steel sheet. To ensure a deeper cut over the seam area.

Clocked parallel to carriage travel........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141118_143044988_zpscec04d7b.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141118_143044988_zpscec04d7b.jpg.html)


Cleaned up both ends, leaving a witness........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141118_144102403_zpscb32920a.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141118_144102403_zpscb32920a.jpg.html)


I could then bore, concentric to each end.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141119_134735677_zps331693db.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141119_134735677_zps331693db.jpg.html)


Then, turn the o/d concentric to bore.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141119_150004745_zpsa5d8b97b.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141119_150004745_zpsa5d8b97b.jpg.html)


There you go.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141119_153258087_zps109954dd.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141119_153258087_zps109954dd.jpg.html)


Open up bore to +.002" on sleeve o/d........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141121_140012713_zps7cc5da88.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141121_140012713_zps7cc5da88.jpg.html)


Loctite in place. And skim the ends........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141125_111058483_zps4d99d199.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141125_111058483_zps4d99d199.jpg.html)


Now, waiting for my pal Dave, who's a whiz with a bore grinder.  ;)

Thanks for looking in!  :ThumbsUp:

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on December 04, 2014, 08:08:52 PM
Now, waiting for my pal Dave, who's a whiz with a bore grinder.  ;)

Here we go...... Arrived, this evening.  :cartwheel:

Lovely bore........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141204_193128927_HDR_zps937dd28f.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141204_193128927_HDR_zps937dd28f.jpg.html)


Thanks Dave! Yer a gem!  :praise2:

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on December 04, 2014, 10:17:18 PM
Time to tackle the cylinder head.
From a piece of 8mm stainless plate, 100mm square. (Room for a spare. If it all goes pear shaped).   :(

It was at, (only), this point, I realised I am not as young as I would like to be........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141125_133933776_zps8111b887.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141125_133933776_zps8111b887.jpg.html)


Several rests, and the following day. It was free.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141126_114058602_zpscd03bfcc.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141126_114058602_zpscd03bfcc.jpg.html)


I usually knock the corners off, by friction turning. In my mini lathe....... No chance!  :ShakeHead:

So, I mounted it in the r/t. And milled it roughly, round.........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141127_145038705_zpsf29a692f.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141127_145038705_zpsf29a692f.jpg.html)


Normal lathework followed. Finally finishing the o/d between blocks.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141203_131913465_zps79dcc335.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141203_131913465_zps79dcc335.jpg.html)


The new head fits as a cap, over the cylinder flange. Giving .150" extra headroom, for a thicker graphite piston crown......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141203_131601288_HDR_zpsdf11de1a.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141203_131601288_HDR_zpsdf11de1a.jpg.html)


Looks rather nice, like this. Seems a pity to go poking holes into it.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141203_131611634_HDR_zpsa917a2c0.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141203_131611634_HDR_zpsa917a2c0.jpg.html)


Twin port! Because the new shim blade, was occasionally sucked into the full width original port........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141204_140020967_HDR_zps9d4be5ef.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141204_140020967_HDR_zps9d4be5ef.jpg.html)


Inside.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141204_134650456_HDR_zps40906a43.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141204_134650456_HDR_zps40906a43.jpg.html)


Much shorter inlet passage. Less heat absorbed into the head. Mebbe........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141204_145051015_zpsf29488fd.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141204_145051015_zpsf29488fd.jpg.html)


Shouldn't rust in there, now........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141204_193054938_zpsd23719a0.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141204_193054938_zpsd23719a0.jpg.html)


Thanks for looking in!   (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

David D
Title: Re: Scott Vacuum Engine......
Post by: Jo on December 05, 2014, 11:47:46 AM
Hacksawing through thick stainless  :( I am surprised that it did not do nasty things to your hacksaw blade as well.

But it was worth it in the end  ;)

Jo
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on December 05, 2014, 01:02:35 PM
Hacksawing through thick stainless  :( I am surprised that it did not do nasty things to your hacksaw blade as well.

But it was worth it in the end  ;)

Jo

I think the total was 5 blades, Jo. Some of them, pre used.  :embarassed:

But, it's ok. I'm a Pensioner. I can afford to buy more........  ;)

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on December 09, 2014, 07:54:47 PM
Steps forward...... Steps backward. But, overall......   (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

Mounted the original c/i piston, on a handy piece of curtain pole, and reduced to fit the new bore.

About -5thou from original.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141205_145739607_zps76a44990.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141205_145739607_zps76a44990.jpg.html)


Assembled. But couldn't get the engine to spin freely. Seems the open end of the bore is a little tight.   (http://www.cosgan.de/images/smilie/konfus/n010.gif) (http://www.cosgan.de/smilie.php)

So...... Turned another length of curtain pole, to a sliding fit. (After sanding off the fuzz)........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141208_133256642_zpsae63ea0e.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141208_133256642_zpsae63ea0e.jpg.html)


Coated in fine grinding paste. And oscillated for 30mins, or so.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141208_145145280_zpsc8ba63b4.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141208_145145280_zpsc8ba63b4.jpg.html)


Seems Dave has gripped on the end of the cylinder o/d, in his industrial machine, and triangulated it! (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)

Re assembled, again. Piston/ bore, dry, no oil. shouldn't pick up. Just a quick test run.

Twin temporary burners, this time.......

https://www.youtube.com/watch?v=I0pQ9PcWSTU


Now, I'm confident to carry on modding, to finish, as planned.  :D


Except......

An hour after running. The piston was stuck in the bore. Again!

The dreaded, condensation rust.........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141209_163923068_zps9aed3e34.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141209_163923068_zps9aed3e34.jpg.html)


Sheesh........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141209_164027880_zps1f909f79.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141209_164027880_zps1f909f79.jpg.html)


Pleased, the lap is still mounted in the chuck. I can polish the bore, for the new graphite piston.

Winter's closing in, on old bones. Not much will be happening this week.

Thanks for looking in!

David D
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on December 22, 2014, 08:04:33 PM
Nice work marra,  Any progress or it maybe a little too cold down youre neck of the woods.
cheers
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on December 22, 2014, 11:01:53 PM
Nice work marra,  Any progress or it maybe a little too cold down youre neck of the woods.
cheers

Thanks, Frazer!
Been a little slow, recently. And cold!

Also, Small Person, needing delivering/ retrieving, from school. Then being entertained, for a while.  :Jester:  Nice..... But.......  :shrug:


Frankly, I'm not sure anyone here, is much interested in what I do, any more.

Counting back, gives 6 postings of progress........ Only one comment, from Jo. (Bless Her)!

The posting on Modder, has the "same" hit count. Also, more questions/ discussions.

Wonder, if I've upset the Purists, who prefer to work strictly to drawings, only?


Anyroad! I've made and tested the shutter guide. Will assemble the pics, and little vid. Posting tomorrow.  (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

David D
Title: Re: Scott Vacuum Engine......
Post by: ths on December 23, 2014, 12:21:05 AM
Never think that there's no interest! I've missed quite a bit lately, but always find what you do to be worthwhile and interesting. May the orphanage continue to let well balanced and hard working engines into the world. Merry Christmas, Mr Drillin'. Hugh.
Title: Re: Scott Vacuum Engine......
Post by: Kim on December 23, 2014, 12:23:17 AM
Hi David,
I doubt that anyone on this forum is upset by anything you're doing here.

I for one, have always enjoyed your posts. I would bet that I'm just one of the silent followers here.

For me, I don't have much familiarity with stirling or vacuum engines, so don't have a lot to say.  But your work is always interesting to me. Someday, I'm going to try my hand at one of these, and it will be that much easier because of what I've learned from following along with your work.

I realized it takes time and effort to post things, so if you choose to post less in the future, I would certainly understand.  But I would love to see you continue posting.

Thanks for what you have shared with us up till now!
Kim
Title: Re: Scott Vacuum Engine......
Post by: Jonfb64 on December 23, 2014, 12:24:33 AM
I'm still following but been distracted by christmas shoppping. :(

looking forward to the next video

Jon
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on December 23, 2014, 01:29:20 PM
Hugh, Kim, Jon.
Thanks Fellas!  It's nice to know my fumblings are being appreciated.......:cheers:


A piece of s/s, 2mm x 75mm square, (£2. Ebay), was made into a piece of 55mm dia. round.

Drilled, to match the cyl head........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141218_133224605_zps53ff68d3.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141218_133224605_zps53ff68d3.jpg.html)


Recessed, 25thou deep, for shutter blade........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141221_110218783_HDR_zps2ac94cd8.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141221_110218783_HDR_zps2ac94cd8.jpg.html)


Window, cut out........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141221_111521362_HDR_zps2cb523ab.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141221_111521362_HDR_zps2cb523ab.jpg.html)


Piston's eye view. The top of the blade can bend outward, to relieve any unwanted pressure........

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20141221_115437899_zps8e170fb7.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20141221_115437899_zps8e170fb7.jpg.html)


I assembled, loosely, no oil. Still with the c/i, (now undersize), polished piston.

Had a bit of a surprise, during engine warm up. It runs, on the hot air gun!  :o

https://www.youtube.com/watch?v=m-Chb3gnXqs


Official trial video........

https://www.youtube.com/watch?v=2KALEUREuEs


I think the next job, aught to be the twin wick burner.  (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)


Thanks for looking in!

David D
Title: Re: Scott Vacuum Engine......
Post by: smfr on December 23, 2014, 05:19:32 PM
Very nice, David! I like how it ran with the hot air gun, too!

Simon
Title: Re: Scott Vacuum Engine......
Post by: ths on December 23, 2014, 07:06:46 PM
Not your average fumblings. Good to see it going so easily. It looks a fearsome creature, with the two burners and inlets. I can only imagine that it would be way down on the list for efficiency, but it's a visual winner, and has its own sound.

Cheers, Hugh.
Title: Re: Scott Vacuum Engine......
Post by: Roger B on December 23, 2014, 07:10:34 PM
As you said "that'll do nicely" It's got an incredible sound  :ThumbsUp:  :ThumbsUp:
Title: Re: Scott Vacuum Engine......
Post by: b.lindsey on December 23, 2014, 07:13:37 PM
I'm still following along too. Hoping the stainless and graphite will solve the condensation issue. I ran into that with the RiderEricsson and know how frustrating it can be. Keep up the fine work, you have more fans than you know!

Bill
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on December 23, 2014, 11:05:44 PM
Simon, Hugh, Roger, Bill.
Thank you all, for your kind comments. They've given me a lift........ :cheers:

The hot air gun, was a complete surprise!  :o
I had warmed the cylinder/ hopper area, and decided to direct the heat inside the cyl. Prior to firing up the temporary burners.

No condensation, using the pre heat system!  :whoohoo:

I've made a start, adapting the burner, to twin wicks.  :)
But. Seems I'm now booked for an 8 hour shift, entertaining a Little Person, tomorrow. No more shop time available, for several days........  :-\

Wishing all MEMers, everywhere. A very, Happy Christmas.

David D
Title: Re: Scott Vacuum Engine......
Post by: b.lindsey on December 23, 2014, 11:39:12 PM
David, its the little people that will hopefully enjoy the fruits of our labors in the years to come...at least I hope they will come to appreciate them.  Little people time is good too, and I look forward to seeing my two g'kids over the holidays. My grandson is 3 and as they are upgrading his bedroom to a bigger boy room, my dau asked me to make a biplane themed bookshelf for him which I am working on now. He is (for now) really into airplanes :)

Bill
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on December 24, 2014, 11:15:13 PM
That's all quite true, and very satisfying Bill! (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

Mia has gone to her other Grandma's, for the night.

She's put out some reindeer food. Hoping they will find her, in the big city of Sheffield.......  (http://serve.mysmiley.net/love/love0001.gif) (http://www.blueislandsdiving.com)


Good luck with the biplane!  :)

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on January 07, 2015, 09:25:36 PM
I've had very little workshop time, these past weeks. But, have made some good, solid progress. (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

I took the top off the original burner......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150107_115202515_zps19e197f9.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150107_115202515_zps19e197f9.jpg.html)


And, made a twin wick burner........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150107_115342708_zps2bd78d45.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150107_115342708_zps2bd78d45.jpg.html)


The engine then proved to be a willing runner! (http://freesmileyface.net/smiley/respect/woohoo-022.gif) (http://freesmileyface.net/free-respect-smileys.html)

The shim valve. When releasing it's pressure, blew onto the flames. Bending them outward. (http://smileys.on-my-web.com/repository/Others/others-221.gif)

So, I filed the top edge of the "window", to direct the pressure more upwards. Better.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150107_111704765_zpscbc75328.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150107_111704765_zpscbc75328.jpg.html)


It's really satisfying, when you begin to understand these engines. (http://smileys.on-my-web.com/repository/Thinking/thinking-020.gif)


The obligatory video.........

https://www.youtube.com/watch?v=vzi0t757Fx0


Next job. We need an "eyebrow", to replace the hacksaw blade. (http://smileys.on-my-web.com/repository/Winks/a-wink.gif)


Also, I've noticed the mild steel shutter, is now scuffing the s/s port area. Will swap material, to brass shim........

Thanks for looking in!

David D

Title: Re: Scott Vacuum Engine......
Post by: b.lindsey on January 08, 2015, 12:52:23 AM
David, why is it that removing the hacksaw blade extinguishes the flame?  It seems to burn ok before you hold the hacksaw blade over it.

Bill
Title: Re: Scott Vacuum Engine......
Post by: Zephyrin on January 08, 2015, 08:25:54 AM
Nice thread and built, thanks to share and bravo for this fine runner !
The condensation rust, yes what a plague, a little drop of vaseline oil, when the engine is running and hot may help to prevent stucked parts for a while...
interesting experiments with the saw blade, hindering cold air intake and increasing speed.
The flamme position is obviously the weakest point of these engines and the most difficult to control.
I never understood how come flame eaters are so noisy, I made four, when compared to Stirling engines...

 
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on January 08, 2015, 11:20:49 AM
David, why is it that removing the hacksaw blade extinguishes the flame?  It seems to burn ok before you hold the hacksaw blade over it.

Bill

Hi Bill. Good question! (http://www.cosgan.de/images/smilie/konfus/n010.gif) (http://www.cosgan.de/smilie.php)

The valve is based on the Poppin design. To be blown off it's seal, by positive pressure.
Poppin's port area is a flat face. So, gasses are blown vertically away.

This one has the shutter frame, above the port area. Consequently, gasses are bounced towards the flame, (see bent flame, in last still pic).
This acts as a "governor".

Separating the in/ out gasses, with the blade, allows revs to rise.
Removing the blade allows the higher rev's gas velocity, to blow out the flame.     (I guess)......  :thinking:

The wicks are, at present, too high. Need to shorten their tubes by a few mm's.

It's all an experiment!  :shrug:

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on January 08, 2015, 11:43:29 AM
Nice thread and built, thanks to share and bravo for this fine runner !
The condensation rust, yes what a plague, a little drop of vaseline oil, when the engine is running and hot may help to prevent stucked parts for a while...
interesting experiments with the saw blade, hindering cold air intake and increasing speed.
The flamme position is obviously the weakest point of these engines and the most difficult to control.
I never understood how come flame eaters are so noisy, I made four, when compared to Stirling engines...

Hi Zephyrin.
Thank you for your kind comments......  :cheers:

At the moment, it has a few drops of light oil, on the cast iron piston.
Once the graphite piston is installed, I hope never to have to lubricate again!  ;)

Noisy? I'm disappointed, mine doesn't quack like a duck. Perhaps a slightly stiffer shutter will do the job.......  :headscratch:

David D
Title: Re: Scott Vacuum Engine......
Post by: b.lindsey on January 08, 2015, 12:14:23 PM
Thanks for the explanation David. I think you may be right...it has more to do with the increase in speed at the point where the blade is removed. Anyway, a fine runner...well done!!

Bill
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on January 10, 2015, 01:14:37 PM
The shutter on my Vacuum motor is a 1/16" thick by 3/8" wide strip of cast iron, I lapped it to the valve face.
                                              Ian S C
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on January 10, 2015, 10:52:04 PM
The shutter on my Vacuum motor is a 1/16" thick by 3/8" wide strip of cast iron, I lapped it to the valve face.
                                              Ian S C

Hi Ian.

Does it have a separate relief valve? Or is it lightly sprung, to the port face?

David D
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on January 11, 2015, 11:11:14 AM
The motor has one port only, it's 1/4"diameter, and held in place by a frame, the only spring in the system is under the valve lever.  To build the motor I had this diagram from an old Model Engineer magazine, a bit of imagination, and some guess work, plus the fact that I don't usually work to drawings.  One of these days I must take a photo of the motor, it's not nice and shiny,  it's heat discoloured, and usually a bit oily,  it works.   Ian S C
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on January 11, 2015, 11:33:30 AM
Thanks Ian!  :cheers:

The motor has one port only, it's 1/4"diameter, and held in place by a frame, the only spring in the system is under the valve lever.

So, the vacuum holds it to the port. Clearance in the frame, allows it to vent. Same as mine......  :ThumbsUp:

To build the motor I had this diagram from an old Model Engineer magazine, a bit of imagination, and some guess work.


Thanks for the drawing!. Where would we be, without imagination and guesswork?  (http://www.cosgan.de/images/smilie/konfus/n010.gif) (http://www.cosgan.de/smilie.php)

plus the fact that I don't usually work to drawings. 

Me neither!  :ShakeHead:

One of these days I must take a photo of the motor, it's not nice and shiny,  it's heat discoloured, and usually a bit oily,  it works.


My kind of engine! (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

Looking forward to the pic.......  ;)

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on January 27, 2015, 11:10:44 AM
I've had very little shop time, recently. Old bones/ cold workshop........  :(

Managed to bend up a s/steel shroud, for the burner flame area.

Then grooved, to give a positive location.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150116_134255567_HDR_zpsnl6xzmzn.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150116_134255567_HDR_zpsnl6xzmzn.jpg.html)


Set it in place........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150116_134442850_HDR_zpsaxnfps6f.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150116_134442850_HDR_zpsaxnfps6f.jpg.html)


And, silver soldered........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150120_142849712_zpshihcllaq.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150120_142849712_zpshihcllaq.jpg.html)


Seems to work well.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150122_133012875_zps8i292jgv.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150122_133012875_zps8i292jgv.jpg.html)


Nice, steady running..........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150122_133238344_zpsukelngfj.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150122_133238344_zpsukelngfj.jpg.html)


Maybe, a little choked? By the recessed shroud.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150122_134021019_zpss29nmowz.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150122_134021019_zpss29nmowz.jpg.html)


Opened it up, a little.........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150122_135516761_zpsypwysqem.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150122_135516761_zpsypwysqem.jpg.html)


That's better!

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150122_140326244_zpsuwdcevho.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150122_140326244_zpsuwdcevho.jpg.html)


Realised the valve assembly had settled a little. The shutter was only just covering the ports. Maybe, allowing pressure to exit horizontally, onto the flames.

Tweaked, to give 2mm overlap........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150126_133922127_zpssufts3uw.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150126_133922127_zpssufts3uw.jpg.html)


All that was left to do, was to experiment with the wick height, and positioning.

Sorry for the amateur dramatics. But, I was, just a little pleased with the result......... 

https://www.youtube.com/watch?v=MaSuLqkoy3c



Still only, loosely assembled, for test purposes. Using undersize c/i piston.

Lots to do yet. But VERY encouraging.  (http://freesmileyface.net/smiley/respect/woohoo-022.gif) (http://freesmileyface.net/free-respect-smileys.html)

Thanks for looking in!  (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

David D
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on January 27, 2015, 11:57:03 AM
David, here we go, got a photo or two. Sorry forgot to put in something to scale against, the bore is 1 inch.
Ian S C
Title: Re: Scott Vacuum Engine......
Post by: b.lindsey on January 27, 2015, 12:38:41 PM
That shroud looks great David!! Nicely done and what a fine runner too.  Once everything is sorted out will you be running it with water in the hopper?

Bill
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on January 27, 2015, 01:15:39 PM
Thanks for showing, Ian.   :cheers:

It certainly looks, to have had a long working life......  ;)



Thanks Bill.  :ThumbsUp:

Each tweak, improved the revs. It was a great buzz, when it topped 600.......  :cartwheel:

The cylinder is still unsealed, to the hopper. Final assembly, will have Hylomar at both ends. Leak free, I hope.  :)

The intention is to have the ability to run all day. At showtime.......  (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)


David D
Title: Re: Scott Vacuum Engine......
Post by: Don1966 on January 27, 2015, 06:05:13 PM
Wow! Dave that's an awesome job you did. Great improvement and she runs a treat. Nice work!  :praise2:

Don
Title: Re: Scott Vacuum Engine......
Post by: Roger B on January 27, 2015, 06:41:56 PM
That's some interesting development work Dave  :ThumbsUp:  :ThumbsUp: It always interests me how really quite small changes can influence how an engine runs  :headscratch:

That looks to be a well used engine Ian  :ThumbsUp:  :ThumbsUp: not just a glass case model  :)
Title: Re: Scott Vacuum Engine......
Post by: sbwhart on January 27, 2015, 07:59:17 PM
Cracking job Dave,

 :whoohoo:

Its really licking along

Stew
Title: Re: Scott Vacuum Engine......
Post by: ths on January 28, 2015, 06:54:58 AM
Fantastic Mr Drillin'. Cheers, Hugh.
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on January 28, 2015, 01:11:40 PM
Don, Roger, Stew, Hugh.

Thanks Fellas. For all your support, and kind comments......  :cheers:

..............................


Happy with the head etc. I'm turning my attention to the other end, of this engine.

There's something wrong........   :headscratch:

It's not the 'orribly designed crank throw. With the big end bearing hanging out in space.    :ShakeHead:

It's not the way the crankshaft ball races wobble, in their oversize housing.   :facepalm:

Shouldn't the flywheel, and cam, bosses, be level with the top of the pedestal casting?

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150120_135603402_HDR_zpsymyprbwi.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150120_135603402_HDR_zpsymyprbwi.jpg.html)


The top of the conrod, is a bit close to the cylinder.........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150120_135653434_HDR_zpsewdznfvl.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150120_135653434_HDR_zpsewdznfvl.jpg.html)


But, there's rather more clearance, down here.........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150120_135721257_HDR_zpso57ykyc4.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150120_135721257_HDR_zpso57ykyc4.jpg.html)


It's desaxe!  :o Don't think that was a design feature!  (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)




The eccentrically cast flywheel, reminds me of a loco wheel.......   :-\

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150120_135749674_zpsbyza5vva.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150120_135749674_zpsbyza5vva.jpg.html)


Would this improve the looks, at all?

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150115_103841274_zpsbf02gn2u.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150115_103841274_zpsbf02gn2u.jpg.html)




Oh. Yes! ........ And, I've got a pair of 'em!  ;)

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150127_135746340_zpsdkfxdwwl.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150127_135746340_zpsdkfxdwwl.jpg.html)



Still have lots of work to do. And, all winter to do it...... (http://smileys.on-my-web.com/repository/Thinking/thinking-011.gif)

David D
Title: Re: Scott Vacuum Engine......
Post by: b.lindsey on January 28, 2015, 01:38:13 PM
David, I see your point as to the bosses and the top of the pedestal and that would also explain why the conrod is closer to the top of the cylinder than the bottom, but as well as it is running I am not sure I would change things. Its a cosmetic thing anyway. Your could always build up the top of the pedestal with filler to make it the same level as the bosses, but ultimately you have to do what satisfies YOU!  As to the flywheel, I personally think the one you have now is more in keeping with the scale of the engine. The two other ones look a bit bulky but that is just me. The main thing is that the engine is running and running well. What would making those changes to the crankshaft end do to the end you have just finished up on so beautifully?

Bill
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on January 28, 2015, 03:05:04 PM
Thanks for your thoughts, Bill.  :cheers:

Point taken, re-cosmetic pedestal. Though, the flywheel side bearing has some .015" float, in the casting.
This will need boring, bushing, etc. Just to stay, as is.......

The desaxe offset, is in the correct direction. (I think). Whether, it makes any difference to the tiny power output, I don't know.

Frankly. I like to see twin flywheel engines. As in, hit n miss type. Just my thing......

I intended to buy (£34), another bronze one, to match. Until, a pal reminded me, I had the straight leg pair, in stock. (Wonder how he knew, cos, I'd forgotten!).  :old:

I can easily reduce the bulkiness. This pair are from the same pouring.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/P1030641_zps838598c7.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/P1030641_zps838598c7.jpg.html)


Nothing will be done, for some time. The Weather Man says........  :ShakeHead:

Plenty of time for more discussion, before I make any permanent changes.

David D
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on January 29, 2015, 11:55:30 AM
David, on seeing how your motor runs, I'm going to make a new cylinder head for my motor with a 1/4" x 1/2" slot instead of the 1/4" hole it has now, might try your eyebrow idea.  I'll use the same as the old one, it's made of cast iron from an old brake disc.
                                                Ian S C
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on January 29, 2015, 10:26:01 PM
Hope all goes to plan, Ian.  (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

I love to experiment........  ;)

David D
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on January 30, 2015, 12:31:37 PM
David, do you use the water hopper for cooling, or have you been running dry, is there a measurable difference?
                                            Ian S C
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on January 30, 2015, 12:43:28 PM
Ian.

The hopper is not sealed to the cylinder, as yet. Though, it will be at final assembly.

I have run it dry, for up to 1/2 hour, with no problems.......  :)

David D
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on January 31, 2015, 11:50:38 AM
It may not make much difference, but then again....  I'v run my motor for about 3 hours at a show using LPG, it's only over the last few years that I'v used meths.
                                                           Ian S C
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on January 31, 2015, 12:04:51 PM
Nice going, hope youve got a stores note for those flywheels :ROFL:
You dont half like a challenge  :naughty:
cheers
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on January 31, 2015, 10:58:00 PM
Nice going, hope youve got a stores note for those flywheels :ROFL:
You dont half like a challenge  :naughty:
cheers

Frazer.......

Where's the fun, in following drawings? I had to do that, all my working life. Look where it got me! :shrug:

Wish I could get out there, and make some swarf.  (http://freesmileyface.net/smiley/others/others-159.gif) (http://freesmileyface.net/free-others-smileys.html)

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on February 06, 2015, 11:50:23 AM
I've been looking on YouTube recently, for some inspiration.  :thinking:

Found these three vids, of Scott engines, with twin flywheels.......


https://www.youtube.com/watch?v=LBPlFAbgwzw


https://www.youtube.com/watch?v=Jozh0sF05eI


https://www.youtube.com/watch?v=XnWViOPgztY


Wondering...... Were the earlier Scott casting sets, twin pedestal/ flywheeled?  :headscratch:

Does anyone know?  :shrug:

David D
Title: Re: Scott Vacuum Engine......
Post by: E.v.d.Berg on February 06, 2015, 12:22:23 PM
Hi David
Ed here.
If you want information about Vacuum engine than I can possibly help, I've also made a few.
I'll show you a few images.
You can also watch the movie

https://www.youtube.com/watch?v=-361ex_2198

https://www.youtube.com/watch?v=NInGevwUMjk
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on February 06, 2015, 03:54:13 PM
The bases look fabricated to me at least on two of those engines marra
Next we need to suss out Mr E.v.d Bergs speed control  :naughty:
cheers
Title: Re: Scott Vacuum Engine......
Post by: E.v.d.Berg on February 06, 2015, 04:44:30 PM
what do you mean The bases look fabricated . I have ALL the parts homemade and manufactured there are no castings. I bought the drawings, then the colored parts I have powder coate by myself.
Ed
Title: Re: Scott Vacuum Engine......
Post by: Stuart on February 06, 2015, 05:28:14 PM
I think he was referring to David's post not yours

You do some fine work I for one would like you to show a bit more detail maybe in a new thread

Stuart
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on February 06, 2015, 05:43:28 PM
Hi Ed.

Thank you, for showing those two beautifully made engines!  :praise2:

I am in awe........  :o


what do you mean The bases look fabricated .

Frazer was replying to my question. Regarding the Poly Models base castings, in the three videos.

I have to agree Frazer. Apart from the third one?  :thinking:

David D
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on February 06, 2015, 08:09:07 PM
Hi Ed, sorry my reply was confusing I was replying to Davids question.
best wishes
frazer
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on February 06, 2015, 11:17:05 PM
Not sure about no3 although where the upright meets the base it looks very crisp to me.
Maybe just my poor eyesight
Back to :happyreader:
cheers
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on February 12, 2015, 11:41:53 AM
I'v made the new cylinder head with a 1/4" x 3/8" port in it, the motor is easier starting that it was with the 1/4" dia hole it had, it still needs to be warmed up to run on meths. It runs at an average speed of 620rpm (don't know what it used to do). Put the gas torch(very small flame) to it, and 850rpm is what I can get, to go faster the spring on the rocker arm would need a redesign.  One thing that is noticeable is the reduced noise, presumably because of lower velocity of the exhaust, the motor with the small hole had quite a sharp pop, pop.
Ian S C  Pic still in camera
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on February 17, 2015, 01:43:03 PM
Hi Ian.

That's a great result!  :ThumbsUp:

I love tweaking. When I get an improvement.........  ;)



Well...... It's been a while!  :embarassed:

Procrastination....... I think, that's the word...... Putting off, the big decision.

I can't keep on, blaming the cold weather. So, I did a couple of gonna do's. For a couple of weeks.

Then I realised, there's probably some more to come. After some more tweaking.  (http://smileys.on-my-web.com/repository/Thinking/idea-013.gif)

So, I raised the shutter opening higher, (the shadow shows the original position), and filed the lip to a knife edge.......


(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/P1040594_zpsuc2sorq5.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/P1040594_zpsuc2sorq5.jpg.html)


Lowered the rear of the wick tubes........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150216_115639067_HDR_zpstrjuhewq.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150216_115639067_HDR_zpstrjuhewq.jpg.html)


And...... With the appropriate flame. It worked!  :whoohoo:

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150216_114931206_HDR_zpsjououpcb.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150216_114931206_HDR_zpsjououpcb.jpg.html)


Then, a pal called. With a canyer just?.........  :-\


The extra revs had convinced me. Whatever I do to the crank/ flywheel end, there will be enough power to drive it.

It's time to start, on the big decision!

I need to know the height of the cylinder, from the underside of the base casting.

Don't have a height gauge...... But, this worked!

Two squares. Held square by an engineer's clamp.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150217_112133640_HDR_zpsvtp8biyz.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150217_112133640_HDR_zpsvtp8biyz.jpg.html)


Measure the height, with vernier........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150217_111036348_zpsgyxyt4zp.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150217_111036348_zpsgyxyt4zp.jpg.html)


Subtracting, half cylinder o/d, gives centre height. (Some 3mm lower than present crank height).......  :facepalm2:

Work is progressing again.......  (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

Thanks for looking in!  :cheers:

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on February 17, 2015, 10:46:44 PM
I've finally made my mind up. There's no turning back, now!  :facepalm2:

It has to be, twin pedestals, and flywheels.........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150217_145511182_zpsfwbyjnnu.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150217_145511182_zpsfwbyjnnu.jpg.html)


David D
Title: Re: Scott Vacuum Engine......
Post by: ths on February 18, 2015, 07:19:18 AM
It gets better and better. Hugh.
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on February 18, 2015, 12:41:16 PM
David, I was wondering, what is the bore, and stroke of The Scott motor, also dia of the flywheel?
Measured power at crankshaft 0.37 Watts
Ian S C
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on February 20, 2015, 09:26:37 AM
David, I was wondering, what is the bore, and stroke of The Scott motor, also dia of the flywheel?
Ian S C

Ian.

The drawings state, 1.312" bore x 2" stroke. Flywheel, 5" nominal dia.......

David D
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on February 20, 2015, 01:11:18 PM
I was wondering, because I think it might be worth scaling mine u by perhaps 50%, ie., 1.5" bore x I can't remember the stroke, but that may end up at 2.5" more or less.  I'v got some 60 mm dia x 100 mm L bits of cast iron some where, I put it away in a safe place!!!  I,v got four 6" flywheels so that's a start.
Ian S C
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on March 07, 2015, 09:56:12 AM
Slow, steady progress........

Cleaned up the casting, in the single pedestal area.

Marked out for crankshaft centre line, and two base pads.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150218_150838704_HDR_zps9tyootro.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150218_150838704_HDR_zps9tyootro.jpg.html)


Milled .03" deep pockets........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150220_125905228_HDR_zpsi3rkhnx3.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150220_125905228_HDR_zpsi3rkhnx3.jpg.html)


Two steel pads. Fitting snugly, in the pockets, also doweled........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150223_145819322_zpsccp4iduv.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150223_145819322_zpsccp4iduv.jpg.html)


Glued with sleevelock. Milled to match each other........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150224_113217038_HDR_zpsfoo4xwhq.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150224_113217038_HDR_zpsfoo4xwhq.jpg.html)


Two 25mm square columns. Held with m6 c/sunk screws and dowels.

Drilled.........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150227_145129888_zpsoxvesura.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150227_145129888_zpsoxvesura.jpg.html)


Reamed, 13mm........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150303_143822413_zps8rzqhw7v.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150303_143822413_zps8rzqhw7v.jpg.html)


Angled the column sides.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150304_150534925_HDR_zpszcqn39t8.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150304_150534925_HDR_zpszcqn39t8.jpg.html)


Radiused.........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150306_144445153_zps5c7m1zka.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150306_144445153_zps5c7m1zka.jpg.html)


How it all fits together........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150306_155037446_zpsmagyaefy.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150306_155037446_zpsmagyaefy.jpg.html)


A quick spruce up, of the flywheels. Increased the diameter of the bosses........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150307_091408300_zpsj9rrqzms.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150307_091408300_zpsj9rrqzms.jpg.html)



Thanks for looking in!  (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

David D
Title: Re: Scott Vacuum Engine......
Post by: Roger B on March 07, 2015, 12:22:26 PM
Nicely thought out rebuild  :ThumbsUp:  :ThumbsUp: I look forward to your finished version  :wine1:
Title: Re: Scott Vacuum Engine......
Post by: ths on March 07, 2015, 07:27:18 PM
Very nice David, that will pay off. Hugh.
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on March 17, 2015, 08:23:36 PM
Roger, Hugh.
Much appreciated. Thanks for your comments!  :cheers:



I've started work on the crank discs.

Two off, 3" square x 10mm blanks. And aching arms.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150309_114412775_zpsna0wnqip.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150309_114412775_zpsna0wnqip.jpg.html)


Topped, to 68mm o/d........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150311_105811453_zpszgrqvwdj.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150311_105811453_zpszgrqvwdj.jpg.html)


Skimmed. Finished at 3/8" thick........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150311_143402585_zpsnrmgxd05.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150311_143402585_zpsnrmgxd05.jpg.html)


Sleevelocked, sleeves. To increased shaft location length......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150313_130443914_zpshv5vfqv8.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150313_130443914_zpshv5vfqv8.jpg.html)


Drilled/ reamed 6mm, for silver steel shaft. Sleeves topped to 8mm dia. No discernible wobble, when spun on shaft.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150316_193929528_zpsuyrzmz6t.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150316_193929528_zpsuyrzmz6t.jpg.html)


Time to make 'em look like crank discs!

If I mill away to centre line, as usual, (l/h disc). I guess the assembly would be "over balanced".

The r/h disk seems more, functional.

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150317_164218023_zps0rog0vep.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150317_164218023_zps0rog0vep.jpg.html)


The present c/i piston and rod assembly, weighs 63gms.

Is there a quick n dirty, simple formula. Which I could understand. To calculate how much weight to remove from big end area?

David D
Title: Re: Scott Vacuum Engine......
Post by: IanR on March 17, 2015, 09:05:19 PM
To do it properly, you need to weigh the little end (reciprocating) and the big end (rotating) separately. Little end plus piston  then divide by 2. Add weight of big end. This gives your weight to be removed, divide by 7.89 for volume in cubic centimetres.

I think this is right, but it's late in the day, so it might not be. See how it looks.
To weigh the ends of the conn rod separately without a hacksaw, rest each end in turn on the scales, with the rod horizontal.
Title: Re: Scott Vacuum Engine......
Post by: Don1966 on March 17, 2015, 11:48:47 PM
Dave thanks for showing your setups because every time I check in I see something different and learn something new.  :praise2:


 :popcorn:
Don
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on March 18, 2015, 11:49:49 AM
Ian.
Thank you! I can work with that. (And, the digital kitchen scales)...... :cheers:

Did I ever mention, I once lived over the hill, from Phelon & Moor?  ;)


Don.
Thanks for that! I try to show how I do it. If I can.......  :D



I've been steadily reducing the flywheel's 1" wide rims. Not wanting to overdo it.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150317_132649149_HDR_zpsb7nv7irx.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150317_132649149_HDR_zpsb7nv7irx.jpg.html)


Now, down to 5/8" wide.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150318_111343632_zpshzymxnis.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150318_111343632_zpshzymxnis.jpg.html)




(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150318_111405820_zps2stkn10u.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150318_111405820_zps2stkn10u.jpg.html)




(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150318_111436991_zpsfjtu4vga.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150318_111436991_zpsfjtu4vga.jpg.html)


I think they look about right. Anyone care to comment?

I can still take more off.........  (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

David D
Title: Re: Scott Vacuum Engine......
Post by: Don1966 on March 18, 2015, 12:01:12 PM
Looks great to me Dave.


Don
Title: Re: Scott Vacuum Engine......
Post by: ths on March 18, 2015, 07:30:39 PM
Looks good from this far away, especially with glasses...cheers, Hugh.
Title: Re: Scott Vacuum Engine......
Post by: IanR on March 19, 2015, 11:43:39 AM
Yes, looking good. I forgot to mention the crankpin weight, should be added in with the big end, best done by calculation at 7.89grams per cc. Just remember to measure the crankpin in centimetres, not millimetres.
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on March 26, 2015, 11:01:37 PM
Don, Hugh.
Thanks for your kind comments!   :cheers:

Ian.
I think, I've got a handle on it. More to follow.......  ;)



"Miliputtyed", where necessary, and sanded/ carved back........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150323_150932719_zpsy7vm8va9.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150323_150932719_zpsy7vm8va9.jpg.html)


A fuff of paint.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150325_143821165_zps6fqg7iif.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150325_143821165_zps6fqg7iif.jpg.html)


And, a tidy.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150326_114339560_zpsagjiuopt.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150326_114339560_zpsagjiuopt.jpg.html)


I think the rim, still needs a bit off the width. And the sidewall depth reducing a little.

David D
Title: Re: Scott Vacuum Engine......
Post by: b.lindsey on March 27, 2015, 01:22:21 AM
Dave they look great to me, nice paint job too :)

Bill
Title: Re: Scott Vacuum Engine......
Post by: NickG on March 30, 2015, 11:24:25 AM
Nice work David, just found this and have enjoyed flicking through your posts. Glad you went with the poppin type valve, it seems the most reliable. Been quiet on model engineering for the last year but it is one of my many new year's resolutions to build the interest back up this year! Engine looks great.
Title: Re: Scott Vacuum Engine......
Post by: sco on March 30, 2015, 11:52:42 AM
That looks the same shade as I've chosen for my McOnie  ;D

Simon.
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 03, 2015, 09:40:49 AM
Dave they look great to me, nice paint job too :)
Bill

Hi Bill.

Thanks for that!  :cheers:

I'll leave the final dimensions, decisions, until I've viewed the painted engine.

It's a bit difficult to imagine finished proportions, at the moment.......

(http://i110.photobucket.com/albums/n95/Dayjo/IMG_20150330_124243233_zpsom1bu741.jpg) (http://s110.photobucket.com/user/Dayjo/media/IMG_20150330_124243233_zpsom1bu741.jpg.html)



That looks the same shade as I've chosen for my McOnie  ;D
Simon.

Hi Simon.

This is what I'm using.......

 (http://i110.photobucket.com/albums/n95/Dayjo/IMG_20150330_124111473_zpsvwv80ks3.jpg) (http://s110.photobucket.com/user/Dayjo/media/IMG_20150330_124111473_zpsvwv80ks3.jpg.html)


I found my fumbly old fingers, can no longer grip the larger can, and press at the same time. Had to use two hands.......  :(

So, I've bought a pistol grip, for the next attempt!  :ThumbsUp:



Nice work David, just found this and have enjoyed flicking through your posts. Glad you went with the poppin type valve, it seems the most reliable. Been quiet on model engineering for the last year but it is one of my many new year's resolutions to build the interest back up this year! Engine looks great.

Hi Nick.

It's really nice to see you back, and posting again. (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

I've missed your input, over the past few adventures.......  ;)


Thanks for looking in Fellas!

David D
Title: Re: Scott Vacuum Engine......
Post by: Don1966 on April 03, 2015, 02:28:04 PM
Good color choice Dave, I like....................  :ThumbsUp:


 :drinking-41:

Don
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 03, 2015, 09:00:23 PM
Good color choice Dave, I like....................  :ThumbsUp:
 :drinking-41:
Don

Thank you, Don!  :ThumbsUp:


I decided, it was time to drill n tap the flywheels, for m3 grubscrews........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150403_131928433_HDR_zps3yoa7dhc.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150403_131928433_HDR_zps3yoa7dhc.jpg.html)


Trying the silver steel shaft, afterwards, it stuck, solid.  (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif) (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)

The only way to part, the parts, was to drill through........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150403_130936785_HDR_zpsgn6gqe6e.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150403_130936785_HDR_zpsgn6gqe6e.jpg.html)


(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150403_131308932_HDR_zpso1rzzvxw.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150403_131308932_HDR_zpso1rzzvxw.jpg.html)


Then drill 8mm dia, and sleeve back, with mild steel insert.

This is not the first time, this has happened to me. I hope it is the last.  (http://serve.mysmiley.net/rolleye/rolleye.gif) (http://www.blueislandsdiving.com)

I can't get over, how tightly the alloy gripped the silver steel. Despite the fact, they were first fitted, some 3 weeks ago. And, have been taken apart/ assembled, more times than a Lego set!

Is there some unwritten rule. "No alloy sleeve, onto silver steel shafts"?  :headscratch:

From a rather miffed, David D
Title: Re: Scott Vacuum Engine......
Post by: fumopuc on April 04, 2015, 06:37:19 AM
Hi David, I am not sure if it is any help in your case, but may be genrally. Using a grubscrew together with a proper fitted shaft and bore could be always cause a problem. The screw will create a minor deformation at the shaft after first tightening and the problem starts. Specially if any later adjustment is necessary a small groove in the shaft will help.The grubscrew will create its deformation in the grove and that will not affect the fitting of the shaft and the bore.
Title: Re: Scott Vacuum Engine......
Post by: Jo on April 04, 2015, 08:15:24 AM
One way to stop the deformation is to put a ali/brass slug under the grub screw, but that assumes the threaded hole is long enough to provide the space needed.

Brass grub screws don't work you can't get them tight enough before they break  :disappointed:

Jo
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 04, 2015, 09:33:14 AM
Achim, Jo.
Thanks Fellas!  :cheers:

I always file a flat on the shaft, at the angle the screw marks/ connects. Never having trouble, from there on.  :)

This problem has happened before, with another pair, from the same cast.......

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/P1030639_zps14fc1604.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/P1030639_zps14fc1604.jpg.html)


I drill/ ream the hole.

Later on, (several weeks?). I drill n tap for grubscrew. Removing the internal burr, with full size drill, or reamer.

Try the shaft in. And it grabs! (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif) (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif) (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)

Incidentally. I'd already polished the shaft, with Scotchbrite. To allow a full length push fit, for the ballraces.  :???:

David D
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on April 04, 2015, 12:41:15 PM
Except for very small motors, I use 10 32 UNF brass grub screws from electric buss bar fittings to hold flywheels and pulleys on shafts down to 1/4" dia if the screw is going to bear on the shaft, ample grip for Stirling Engines, and vacuum motors. Most of my pulleys and FWs are bored 3/8" now, and for smaller shafts a split bush is fitted, and a steel grub screw can then be used.
Latest Stirling Engine has got a taper lock fitting to hold the FW, quite impressed with its gripping power.
Ian S C
Title: Re: Scott Vacuum Engine......
Post by: sco on April 04, 2015, 09:09:12 PM
Maybe some gentle heat or one of the freezer sprays might have worked due the difference in thermal expansion steel vs. Ally?

Simon.
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 09, 2015, 08:53:17 PM
Thanks Ian!  :ThumbsUp:



Maybe some gentle heat or one of the freezer sprays might have worked due the difference in thermal expansion steel vs. Ally?
Simon.


Not worth messing with, Simon.

I just lost 3/4" length of shaft. There was still enough left, to cut in half for the two sides.  ;)


Finished the re sleeving. All went well........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150406_114337003_zpsyzqa6mzo.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150406_114337003_zpsyzqa6mzo.jpg.html)



I decided to house the big end bearings, inside the flywheels.

Opened out with end mills, in 2mm steps.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150323_112136187_zpsmt4quk48.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150323_112136187_zpsmt4quk48.jpg.html)


Final pass, with 13mm slot drill, 5.5mm deep.........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150325_142257385_HDR_zpsmb7zdbd6.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150325_142257385_HDR_zpsmb7zdbd6.jpg.html)


Should be a nice shove in fit, probably..........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150326_103749687_zpsry0llhua.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150326_103749687_zpsry0llhua.jpg.html)


Sandwiched the cam, between two 5mm thick cast iron discs. Drilled & tapped m3. All held with sleevelock........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150326_104141994_HDR_zpscjnjckxf.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150326_104141994_HDR_zpscjnjckxf.jpg.html)


Slips in here, nicely. Plugged the grub screw hole, with it's annoying click........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150409_085052708_HDR_zpsm9j84tjj.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150409_085052708_HDR_zpsm9j84tjj.jpg.html)


A bit of clearance, here........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150407_114449586_zpsuyu7eqci.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150407_114449586_zpsuyu7eqci.jpg.html)


And there........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150407_114541474_zpsku2tugir.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150407_114541474_zpsku2tugir.jpg.html)


Screwed it all together. First flick, away it went!   :whoohoo:

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150408_175022862_zpsx8mdbfcb.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150408_175022862_zpsx8mdbfcb.jpg.html)


And the video. Cos, I know someone will ask.........

https://www.youtube.com/watch?v=ykoye7Nch8A


It's now in lots of pieces, for final finishing and assembly.........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150409_190338788_zpsuczao1up.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150409_190338788_zpsuczao1up.jpg.html)


Thanks for looking in!  (http://freesmileyface.net/smiley/respect/respect-048.gif) (http://freesmileyface.net/free-respect-smileys.html)

David D
Title: Re: Scott Vacuum Engine......
Post by: NickG on April 09, 2015, 09:32:44 PM
Best looking Scott vacuum I've seen
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 09, 2015, 10:21:13 PM
Best looking Scott vacuum I've seen <img src="http://s3.amazonaws.com/tapatalk-emoji/emoji106.png" />

Thanks Nick!  :cheers:

Wait til I get some paint on it........  ;)

David D
Title: Re: Scott Vacuum Engine......
Post by: Graham G on April 10, 2015, 01:00:12 AM
 :cheers: Very Very nice  :AllHailTheKing:
Graham
Title: Re: Scott Vacuum Engine......
Post by: Don1966 on April 10, 2015, 01:24:51 AM
Dave that is just awesome and a beauty to boot. I like............................. :praise2: :praise2:


 :drinking-41:
Don
Title: Re: Scott Vacuum Engine......
Post by: Admiral_dk on April 10, 2015, 01:32:45 PM
Nice engine and great sound - fantastic to have it running on first flip  :praise2:
Title: Re: Scott Vacuum Engine......
Post by: fumopuc on April 10, 2015, 07:07:19 PM
Hi Dave, that's a real runner. Congratulations.
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 10, 2015, 07:43:14 PM
Graham, Don, Admiral, Achim.
Thanks for your kind comments chaps!  :cheers:

During assembly, I set the cam to close the shutter at 45* before bdc. Intending to fiddle, as necessary.  :thinking:

It wasn't necessary!   ;D



Today, was sprayday..........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150410_134428983_zpspd2whldk.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150410_134428983_zpspd2whldk.jpg.html)


For anyone like me, with disobedient fingers/ hands. I can recommend the cheap pistol grip. Works a treat!   :ThumbsUp:

This was how it looked, at knock off........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150410_173432137_zpsspxxnwpr.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150410_173432137_zpsspxxnwpr.jpg.html)

Thanks for looking in!

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 20, 2015, 07:58:12 PM
More, gentle progress.

The original clevis, was ok for length, but, not easily adaptable for a graphite piston.
I like to have a spigot, with a flange either side of the piston crown.

So, I chopped off the end of the rod, and re drilled.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150414_194533281_zpsbny4sljo.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150414_194533281_zpsbny4sljo.jpg.html)


There's a new piston, hiding inside this generous lump. Thanks, Andrew!  (http://smileys.on-my-web.com/repository/Respect/respect-048.gif)

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150415_103706128_HDR_zps4guc8neh.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150415_103706128_HDR_zps4guc8neh.jpg.html)


And....... Yer tiz........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150420_190339632_zpswyuj1xac.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150420_190339632_zpswyuj1xac.jpg.html)


Balance time. Piston end........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150420_103825649_HDR_zpsala2mgqn.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150420_103825649_HDR_zpsala2mgqn.jpg.html)


Big end........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150420_103959562_HDR_zpsuytsfjcn.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150420_103959562_HDR_zpsuytsfjcn.jpg.html)


Couldn't make up me mind, which was the best way to lose, only 12gms per disc. (http://smileys.on-my-web.com/repository/Thinking/thinking-022.gif)

In the end, I went for slots........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150420_135058834_HDR_zpsn6liijxr.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150420_135058834_HDR_zpsn6liijxr.jpg.html)


Non too bad, I think........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150420_192542602_zpsuynhjypw.jpg)
 (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150420_192542602_zpsuynhjypw.jpg.html)


Thanks for looking in!

David D
Title: Re: Scott Vacuum Engine......
Post by: ths on April 21, 2015, 09:51:05 PM
That's interesting David, and nice looking slots too. Cheers, Hugh.
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 22, 2015, 10:51:10 AM
Thanks, Hugh! (http://smileys.on-my-web.com/repository/Respect/respect-048.gif)



I finished off the crank assembly, yesterday. Test run went ok.

Up the other end. The 5 thou thick shutter, runs in a 25 thou deep recess. I thought it was rather a sloppy fit.  :thinking:

So, I milled off 10 thou, best I could, then polished the face, on a flat surface.......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150422_091745690_HDR_zpsvmhzfmjn.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150422_091745690_HDR_zpsvmhzfmjn.jpg.html)


It's now, gone from a popper....... To a quacker........

https://www.youtube.com/watch?v=zqqGf8JL86k


A blummin LOUD quacker!   :facepalm2:

Sheesh........

David D
Title: Re: Scott Vacuum Engine......
Post by: Jo on April 22, 2015, 10:56:13 AM
That has a character all of its own  :naughty:

Jo
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 22, 2015, 11:02:33 AM
That has a character all of its own  :naughty:

Jo

Thanks Jo.

A very noisy, character......  :o

Hurts me ears. And, I'm deaf!  (http://smileys.on-my-web.com/repository/Thinking/thinking-012.gif)

David D
Title: Re: Scott Vacuum Engine......
Post by: fcheslop on April 22, 2015, 12:28:21 PM
Bet the neighbours love you :stir:
Nice result Im tempted :facepalm: A far better design than the original.
Thought Id better poke my neb in just to show Im in the land of the living
 
Title: Re: Scott Vacuum Engine......
Post by: Stuart on April 22, 2015, 02:25:44 PM
David

 It's a quacker of a engine  :Jester:

Sorry could not resist a pun

Stuart
Title: Re: Scott Vacuum Engine......
Post by: b.lindsey on April 22, 2015, 02:44:44 PM
Yep, it a quacker alright, but it sure runs nice and looks great David!!

Bill
Title: Re: Scott Vacuum Engine......
Post by: sbwhart on April 22, 2015, 05:57:08 PM
Bloody hell Dave you've built a Chesterfield Duck  :Jester: :lolb: :lolb:


The video drove me Quakers

Looking good but sounding:----------------- ducky

Stew
Title: Re: Scott Vacuum Engine......
Post by: ths on April 22, 2015, 10:23:43 PM
Would oil help? Anyone would smile at that. Hugh.
Title: Re: Scott Vacuum Engine......
Post by: NickG on April 25, 2015, 07:24:30 AM
Haha classic video Dave!
I think it could be the reed type valve being blown off its seat then vibrating in its guide? Might help setting the timing to open a bit earlier although the good thing about these is, you don't need to worry about the valve open timing too much as it is light enough to be blown off its seat when the engine is good and ready. That, I guess could depend on many factors such as cylinder temp. How much and how hot the air its drawn in is etc. Could your guide be restricting this happening and slowing the engine down?
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 25, 2015, 10:46:07 PM
Thank you for all your comments Chaps!  :cheers:

I dunno where the duck came from, or why! I hadn't made any drastic changes...... :headscratch:


Not too much to show, for this week. But....... I've almost finished the final build! (http://smileys.on-my-web.com/repository/Happy/happy-132.gif)

I'm making several mods, and upgrades as I go along.

Before finally sealing the cylinder into the hopper, the bore caught my eye. All that time spent honing, was worth it........

(http://i110.photobucket.com/albums/n95/Dayjo/IMG_20150421_080604436_zps36fl56cd.jpg) (http://s110.photobucket.com/user/Dayjo/media/IMG_20150421_080604436_zps36fl56cd.jpg.html)


Seven ball races, in the crank assembly. The fixed crankpin, links the two halves together.........

(http://i110.photobucket.com/albums/n95/Dayjo/IMG_20150424_192927279_zpsiiinpdgd.jpg) (http://s110.photobucket.com/user/Dayjo/media/IMG_20150424_192927279_zpsiiinpdgd.jpg.html)


Then, the whole assembly is held by two countersunk M6 screws......

(http://i110.photobucket.com/albums/n95/Dayjo/IMG_20150423_083950266_zps9i38efxx.jpg) (http://s110.photobucket.com/user/Dayjo/media/IMG_20150423_083950266_zps9i38efxx.jpg.html)


Building a bit. Test running a bit........ I'm pleased to report, the duck has flown! Normal popping has returned........   :whoohoo:

Thanks for looking in!

David D
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 27, 2015, 10:36:55 PM
I'm doing the fiddly, finishing, faffing about, at the moment.  :(

Rolled up a pair of stainless mesh, wicks. Action photo........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150427_150227866_zpsb02nnu7g.jpg)
 (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150427_150227866_zpsb02nnu7g.jpg.html)

The finishing line is in sight! (http://smileys.on-my-web.com/repository/Respect/woohoo-022.gif)

Thanks for looking in.

David D
Title: Re: Scott Vacuum Engine......
Post by: Don1966 on April 27, 2015, 10:54:34 PM
Dave beautiful work and I have to ask. How do you get such a blue flame from the meth?

Don
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 27, 2015, 11:05:47 PM
Hi Don. Thank you!  :cheers:

I have started making my wicks from stainless steel, 100 mesh. As they do not burn down, nor rust.

They always give a mostly blue flame, compared to the stove rope, I have previously used.

Note, on this earlier video. The l/h burner is stove rope, r/h burner is 100 mesh........

https://www.youtube.com/watch?v=2KALEUREuEs


David D
Title: Re: Scott Vacuum Engine......
Post by: b.lindsey on April 27, 2015, 11:49:29 PM
Interesting result on the wick comparison David. Maybe the mesh allows more air to mix with the meths giving cleaner combustion. Just a thought but the difference is obvious.

Bill
Title: Re: Scott Vacuum Engine......
Post by: Graham G on April 28, 2015, 07:46:36 AM
hi there David D,  I do like your blue flame and I have to wonder if a copper wick would give you a green flame, also I am very impressed with your camera talents.
Graham
 
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 28, 2015, 11:21:42 AM
Hi Bill.

I really, don't know the reason.

This wick is not quite as efficient as the fibreglass stove rope. Though I prefer it, for it's durability.

I tried all the different wire permutations, during my Bengs, Nick, build saga. They rusted, once the galvanise had burned away.  :(


Hi Graham.

Copper wick? No!

(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/IMG_20140602_181457700_zpsfeadac84.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/IMG_20140602_181457700_zpsfeadac84.jpg.html)


I think the copper, conducts too much heat out of the flame.  :ShakeHead:

Thanks for the camera comment!  :cheers:

Both still, and video's, are taken on my Motorola phone's camera. I don't use my Panasonic, any more.  :shrug:

David D

Title: Re: Scott Vacuum Engine......
Post by: Jo on April 28, 2015, 12:05:26 PM
You had me worried there David I thought you had killed the quack   :LittleDevil:

Jo
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 28, 2015, 08:22:07 PM
You had me worried there David I thought you had killed the quack   :LittleDevil:
Jo

Jo.
Not killed. Controlled....... (http://smileys.on-my-web.com/repository/Unhappy/censored-108.gif)

Today, I made a shutter template/ drill jig. (R/h end).........

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150428_194550382_zpseofjqpr4.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150428_194550382_zpseofjqpr4.jpg.html)


Testing several different blades, I found some of them quacked.  >:(

Until, I turned them around. (http://smileys.on-my-web.com/repository/Respect/respect-048.gif)

Must be the varying resistance, to bending away from the port.  :thinking:

David D

Title: Re: Scott Vacuum Engine......
Post by: tvoght on April 28, 2015, 08:26:27 PM
I'm late in saying this is a very nice engine. Thanks for the stainless steel wick hint!

--Tim
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 29, 2015, 08:56:34 AM
I'm late in saying this is a very nice engine. Thanks for the stainless steel wick hint!
--Tim

Thank you, Tim!  :cheers:

The next step of the experiment, is to try a finer mesh. Probably, 200 or 300 size.......  :thinking:

David D
Title: Re: Scott Vacuum Engine......
Post by: Roger B on April 29, 2015, 02:37:38 PM
Excellent work as ever  :praise2:  :praise2: It now seems to be moving from restoration to R&D  :)
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on April 30, 2015, 08:20:06 PM
Excellent work as ever  :praise2:  :praise2: It now seems to be moving from restoration to R&D  :)

Thanks Roger!  :cheers:

Frankly, it's all experimentation, really.......   ;)




It's finally finished!!  (http://smileys.on-my-web.com/repository/Respect/woohoo-022.gif)

An overcast/ bright, day. Perfect for the final pics and video, on the tartan, in my greenhouse.   (http://smileys.on-my-web.com/repository/Respect/respect-048.gif)

Started up, in the workshop. Running faultlessly.

Filled with coolant. No ripples. So, crank must be balanced ok. Life is good........

https://www.youtube.com/watch?v=-YavSwbS9iM



Then, I noticed the spreading puddle of coolant, from the rear of hopper!  (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)   (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)

Time for another stripdown.....  (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)  (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)

You were right, Young Frazer. The Hylomar has rolled out of the groove, on assembly! (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)  (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)

Also. The c/i cylinder is rusting, already....... (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)  (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)


(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150430_113152554_zpsxz44so6f.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150430_113152554_zpsxz44so6f.jpg.html)


So, I've ordered some O rings.......  (http://smileys.on-my-web.com/repository/Sad/sad-007.gif)

David D
Title: Re: Scott Vacuum Engine......
Post by: NickG on April 30, 2015, 11:00:26 PM
Superb David, and not a duck in sight!
Title: Re: Scott Vacuum Engine......
Post by: ths on April 30, 2015, 11:49:25 PM
It's really making you work for it, isn't it! Cheers, Hugh.
Title: Re: Scott Vacuum Engine......
Post by: Jo on May 01, 2015, 08:47:12 AM
 :'( I liked that duck call.

I could just see the children at the shows dragging their poor unsuspecting mother over "Mummy, Mummy come and the engine that goes quack, Mister can you make your engine go quack again, please, special for my Mum"  :naughty:

Jo
Title: Re: Scott Vacuum Engine......
Post by: sco on May 01, 2015, 01:33:47 PM
An alternative to the O rings might be something like Threebond 1104 - I think it's brilliant stuff!

Simon.
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on May 01, 2015, 01:36:17 PM
Probably a good thing the quack has gone :ROFL:, duck shooting season starts today in NZ.
Ian S C
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on May 13, 2015, 09:02:58 AM
Thanks for all your comments Chaps!  :cheers:


The O ring idea, didn't work. Leaked, again........  (http://smileys.on-my-web.com/repository/Unhappy/brick-wall-017.gif)

So, I filled the groove with Hylomar. Then wrapped around with thick cotton. To fill the groove a little proud.
Then applied more Hylomar, once it was through the first bore, before entering it into the rear one.

It worked........  (http://smileys.on-my-web.com/repository/Winks/icon_wink.gif)

Now, using coolant mix, at 10/1. No rust, so far........


Well........ It's finally finished!   (http://smileys.on-my-web.com/repository/Respect/woohoo-022.gif)

The sun was shining too brightly for the camera. The actual colour is Ford burgundy......

(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150512_134552396_zps9plzfq6d.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150512_134552396_zps9plzfq6d.jpg.html)




(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150512_134452858_zpsejlawv9v.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150512_134452858_zpsejlawv9v.jpg.html)




(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150512_134319246_zpsqkhbizub.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150512_134319246_zpsqkhbizub.jpg.html)




(http://i110.photobucket.com/albums/n95/Dayjo/2015%20Onward/IMG_20150512_134419744_zpsfwm4uafr.jpg) (http://s110.photobucket.com/user/Dayjo/media/2015%20Onward/IMG_20150512_134419744_zpsfwm4uafr.jpg.html)


The duck, is still nearby. The wind was a nuisance, too.......

https://www.youtube.com/watch?v=mC4vm7qyjIY


Thanks for following along!  (http://smileys.on-my-web.com/repository/Respect/respect-048.gif)

David D
Title: Re: Scott Vacuum Engine......
Post by: Don1966 on May 13, 2015, 03:47:52 PM
Dave that's a sweet engine and you have done yourself proud. Beautiful work mate...................... :praise2:

Don
Title: Re: Scott Vacuum Engine......
Post by: b.lindsey on May 13, 2015, 07:07:29 PM
Glad you got it all sorted out David. The end result was sure worth all the effort from my perspective. Nice sounds and good steady running even outside in the wind.  I noticed in the last video the coolant was beginning to steam just a bit.  How long does it take for that to happen?

Bill
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on May 14, 2015, 10:30:46 AM
Don, Bill.
Thank you, for your kind comments, and for following the long winding trail........  (http://smileys.on-my-web.com/repository/Respect/respect-048.gif)

I always do the final pics/ film, in my 6'x8' greenhouse, with the door ajar. It was a very blustery day! (http://smileys.on-my-web.com/repository/Others/others-221.gif)

The first whisps of steam, show after 15 mins, or so. I added a small top up, after about an hour.

Hope to run all day, at the J26 show, June 6th.......  :whoohoo:

David D
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on May 14, 2015, 01:46:31 PM
I once managed to run my motor(air cooled) for about 6hrs out doors on a calm day.  I ran it on LPG, as it wouldn't run on meths in those days.
    This is the modified valve, changed from a 1/4" hole, to a 1/4" x 3/8" slot, it needs a stronger spring under the rocker arm.
Ian S C
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on May 19, 2015, 02:59:06 PM
I'v done some mods to the engine, fitted new spring under the rocker arm.  With the burner I was using, it had a wick of 5/16" diameter bundle of iron wire, this burner would run the motor for 13 minutes with 3 bottle caps of meths, I made a new burner with a 3/16" wire bundle, that runs for 18 minutes on 2 caps of meths, and the speed of the motor has increased from an average of 520 rpm, to 600 rpm, and the motor doesn't get so hot.  I'm sure it would go quite well with a 1/8" wick, this size would have 25 wires compared to the 3/16" one with 50 wires.
I think you might find that your motor will work better on long runs with a smaller single wick.
Ian S C :thinking:
Title: Re: Scott Vacuum Engine......
Post by: Stilldrillin on May 19, 2015, 10:22:44 PM
Thanks for showing your valve, and burner observations, Ian.  :ThumbsUp:

I think you might find that your motor will work better on long runs with a smaller single wick.

Worth a try!  ;)

David D
Title: Re: Scott Vacuum Engine......
Post by: Ian S C on June 04, 2015, 01:43:28 PM
I,v been doing further work on my motor, I'v fitted a small DC electric motor as a generator,  The generator has a pulley about 1/4" dia, and I put a 1 3/4" pulley on the crankshaft, with that it will run a 6volt radio to full power, or quite a number of LEDs, I'v only tryed 3 white LEDS in parallel.  This would be good for a demonstration run.  Find a low voltage(6V or less), and low speed motor, I had to sort through about half a dozen before I found the right one.
Ian S C
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