Author Topic: We'll Call it Metisse......  (Read 15284 times)

Offline Stilldrillin

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Re: We'll Call it Metisse......
« Reply #30 on: August 15, 2013, 09:27:38 AM »
No available shop time, this morning.......

But. A quick calculation, gives a displacement ratio of 1.834. Not a lot, in my opinion.  :headscratch:

Sleeving the cylinder bore, to give 14mm dia, gives 2.394.

Think I'll give it a go. Unless anyone else has any ideas?  :shrug:

David D

David.
Still modifying bits of metal... Occasionally, making an improvement!
Still drilling holes... Sometimes, in the right place!

Offline Ian S C

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Re: We'll Call it Metisse......
« Reply #31 on: August 15, 2013, 01:46:20 PM »
David D,  There are a couple of threads on this engine in the Model Engineer web site, they are "Interpreting drawing", and "Hot air Engine", both by Cornish Jack, I don't know (yet)if he got his going.     Ian S C

Offline Stilldrillin

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Re: We'll Call it Metisse......
« Reply #32 on: August 18, 2013, 01:54:47 PM »
Thanks Ian.
I found one of them. But, he hadn't got a runner at that point, had he?


I roughed the cylinder sleeve o/d, to just over, size - 2 thou'.
Drilled out 13mm. Then bored carefully, until I had a finish I was happy with.

Around .540" bore.........




Topped the o/d. Until the cylinder would push on.

Then, polished it with the Scotchbrite pad........




THAT, was when I noticed the flange was loose on the cylinder!  :facepalm:

Another assault with the digging in tool. Another soldering session.  :wallbang: :wallbang:

Soft solder, this time.........




Looks ok, I think........




Slidelocked, honed and assembled. Before owt else goes wrong........




Made a piston blank. Plus .010 on the o/d.

Made a fixture, with M3 screw thread.........




Finish turned the piston blank. Polished the final resistance marks away with Scotchbrite........




And....... Assembled it.


Oiled, where necessary.


And lit a temporary burner.


And waited.


For about 20 seconds.




And.............




Oh.......... HAPPY DAY!   :whoohoo:   :cartwheel:


That's another little engine, doing what it's supposed to do.........  :ThumbsUp:

Thanks for watching!

David D


David.
Still modifying bits of metal... Occasionally, making an improvement!
Still drilling holes... Sometimes, in the right place!

Offline vcutajar

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Re: We'll Call it Metisse......
« Reply #33 on: August 18, 2013, 02:02:26 PM »
Nice one David.

Vince

Offline Don1966

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Re: We'll Call it Metisse......
« Reply #34 on: August 18, 2013, 02:38:15 PM »
Nice work Dave are we going to see a video?

Don

Online b.lindsey

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Re: We'll Call it Metisse......
« Reply #35 on: August 18, 2013, 02:59:31 PM »
I hadn't checked in in a while David...but a beautiful result for sure. Thanks for sharing the restoration here.

Bill

Offline Stilldrillin

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Re: We'll Call it Metisse......
« Reply #36 on: August 18, 2013, 03:18:14 PM »
Vince, Don , Bill.
Thanks for your replies, and taking an interest.

It's not over, just yet. Parts are rather loose, to eliminate any doubts over friction areas.

I think I will fit brass main bearings, which will allow the crank to centralise better.

Also, I have to source/ make a burner.


Then..... We'll have a video!  ;)

Thanks for watching!  :ThumbsUp:
David.
Still modifying bits of metal... Occasionally, making an improvement!
Still drilling holes... Sometimes, in the right place!

Offline Bearcar1

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Re: We'll Call it Metisse......
« Reply #37 on: August 18, 2013, 05:18:46 PM »
Great to see that your perseverance paid off and what once was a lump on the shelf is now a display runner. Nicely done.


BC1
Jim

Offline Stilldrillin

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Re: We'll Call it Metisse......
« Reply #38 on: August 20, 2013, 09:59:59 PM »
Jim.
Thank you!  :cheers:


Final assembly.....

I decided to re install the twin ball races, but with a 3mm wide spacer between.

This will give a wider bearing in each frame, and a boss, to position the outer wheels.........




Fired up. Away she went, for 30 secs. Then ground to a halt! This happened several times.......

I finally realised, the crankshaft was insisting on migrating to the left, until it was too far out of alignment!  :wallbang:

So, I faced a spacer to give a .01" x 5mm dia step. (Inner race diameter). So, no rubbing during contact/ crank positioning.
This worked, sort of!  :thinking:

Nowt else for it. Bossed spacers, each side of the bearings!

Two, at 2mm wide, either side of the crank throws. Also the flywheel and disc spacers.

"Nil" end float now........




The now unused, Maiwald burner fitted ok, after shortening the wick tube........




The hole for the threaded crankpin is tapped at an angle. I could have drilled, plugged, and re tapped. But!

Once in position, I bent the screw. Aligning it with, "Engineer's Eye". It works well........




All done........




The video........

<a href="http://www.youtube.com/watch?v=uojzo6hqW7g" target="_blank">http://www.youtube.com/watch?v=uojzo6hqW7g</a>


That's another one sorted!  :pinkelephant:

Thanks for watching........  :)

David D




David.
Still modifying bits of metal... Occasionally, making an improvement!
Still drilling holes... Sometimes, in the right place!

Offline techonehundred

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Re: We'll Call it Metisse......
« Reply #39 on: August 20, 2013, 10:35:43 PM »
Thanks for putting this up.  I have one of these that I have worked for months trying to get it to run.  I had given up.  Looks like now I have a few more things to try.  Great to see someone can get one of these to run.

Offline Stilldrillin

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Re: We'll Call it Metisse......
« Reply #40 on: August 20, 2013, 11:10:46 PM »
Thanks Tech.

This is not my first, stirling engine, which has needed a smaller power piston, to adjust the ratio. "Ye canny change the laws of physics"......  ;)

David D
David.
Still modifying bits of metal... Occasionally, making an improvement!
Still drilling holes... Sometimes, in the right place!

Offline Maryak

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Re: We'll Call it Metisse......
« Reply #41 on: August 20, 2013, 11:21:56 PM »
Beautiful Job David  :NotWorthy:

Best Regards
Bob
Если вы у Тетушки были яйца, она была бы Дядюшкой

Offline Dave Otto

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Re: We'll Call it Metisse......
« Reply #42 on: August 21, 2013, 01:08:44 AM »
Beautiful little engine and a great runner.

Thanks for sharing.

Dave

Offline Don1966

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Re: We'll Call it Metisse......
« Reply #43 on: August 21, 2013, 01:18:58 AM »
Beautiful job Dave and she run great.  :praise2:

Don

Offline ths

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Re: We'll Call it Metisse......
« Reply #44 on: August 21, 2013, 10:14:36 AM »
Mr Drillin',

I like the cut of your tartan!

Hugh.