Author Topic: A Wee Wobbler Live Steam  (Read 6308 times)

fcheslop

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A Wee Wobbler Live Steam
« on: November 17, 2012, 02:02:14 PM »
Hi, I built Mr Senfits Thimble engine about 20 years ago and kept thinking I could go a little smaller so here she is a 1mm bore 1.5mm stroke oscillator
Guess I'm lucky been very short sighted I can work close up without the need of a magnifying glass but I did need to use my eye glass a few times.
The boiler housing was first up reckoned Id start on the larger stuff first
The base was simply step turned

And  top ring turned from a bit of srap alloy bronze

Then to the mill to drill the holes for the uprights

Handy having two chucks

The base was then flipped round to machine to length

The uprights next machined and tapped10B.A

The finished frame

Next up the burner was turned from a scrap bit of 5/8 brass

Bored out first then simply pushed onto a mandrel to finish turning


Then a bse turned up and soft soldered in

Looks ok to me and no leaks

Next up the wick holder
Sorry for the crumy pics the macro on my camera is not good enough nor are my piccy taking skill but hopefully you will get the idea

Next up the boiler I normaly spin small parts but failed this time just could not stop the material cracking :hammerbash:
Heres the failed former

and an attempt at spinning just to show all didnt go well :Doh:


Oh dear nothing for it machine it from a bit of copper

A mandrel was turned running the lathe in reverse using a boring tool so the the tapers are the same and the boiler end faced up


The finished prts ready for hard soldering

Not looking so pretty now so of to the pickle and a quick clean up


The finished boiler and stand.Well thats the bigies out of the way

Next up the flywheel and main bearing just simple turning jobs

Thanks for looking in back soon :smokin2:
« Last Edit: November 17, 2012, 02:34:01 PM by fcheslop »

fcheslop

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Re: A Wee Wobbler Live Steam
« Reply #1 on: November 17, 2012, 02:59:52 PM »
Onward in a fashion
The crank next.The big end is0.010 dia and the shaft 0.017 dia a little fiddly but with care and a few scrappers eventually got it done
The mill and rotary was centered up first then the crank throw set.

The big end pins hole then drilled

back to the lathe to drill for the main crank pin

For drilling small holes I made this simple set up .Just a pin chuck that revolves in a centre.Simply grip the pin vice and gently push you can feel the drill working and if it gets a little tight just let go and the chuck spins.It works for me and I use it to make all sorts of small jets and pivots.

So we now have a crank :ThumbsUp:


Next up the engine frame.The ports are 0.008 dia.
« Last Edit: November 17, 2012, 06:48:20 PM by fcheslop »

Offline ScroungerLee

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Re: A Wee Wobbler Live Steam
« Reply #2 on: November 17, 2012, 05:53:53 PM »
Nice work.  I have been wanting to make. Thimble engine so that when people ask what I spend so much time on in my shop I at least have something to show them running.  Half size looks like it would be fun for me, I love small stuff :)

I will follow along, and copy your methods probably.

Thanks,
Lee
Mmmmm.... Shiny!

fcheslop

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Re: A Wee Wobbler Live Steam
« Reply #3 on: November 17, 2012, 07:07:42 PM »
Thanks Lee, if there is a tip to building this engine prepare plenty of material for a few attempts at each part as it saves having to go back to step one.Well some times
The frame was machined completely on a stick of material
As my mill is rather old and definatly out of tram a piece of alloy was trued up and all the parts either glued or clamped to it very much as per the instructions in the book

The frame was then drilled for the pivot and the bore reamed

then flipped over to drill and tap 12B.A for the boiler connection

Next up the drilling jig for the ports was made from a bit of 1/32 steel and simply super glued to the pre machined alloy block

Then onto the cylinder .This part is bronze again as per the book
Two blanks were prepared and machined to 0.100 slightly smaller than the original design

Then back to the lathe the pivot is 0.090 from the end of the cylinder so a 0.180 dia set up bar was machined and clocked in using the four jaw chuck

As you can see one jaw was marked up and this jaw will not be moved as it is now to the correct postion for the pivot
« Last Edit: November 17, 2012, 07:46:41 PM by fcheslop »

fcheslop

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Re: A Wee Wobbler Live Steam
« Reply #4 on: November 17, 2012, 07:22:44 PM »
The pivot pin was then turned onto the cylinder blank and for the first time on this build in one go


A test assembly just to see if every thing is square


Sorry for the crummy picies but these parts are a little small
The cylinder was then reamed to size again on the alloy jig

Then cut off the stock

The jig was then assembled onto the frame to dril the ports along with the crank spacer



The ports were then drilled in the frame and the cylnder sorry no pics

fcheslop

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Re: A Wee Wobbler Live Steam
« Reply #5 on: November 17, 2012, 07:39:40 PM »
The engine was then assembled and test run on air  :whoohoo: :whoohoo: a runner so a steam test



Thanks for looking in that's about all for this little build
Was it fun you bet :Lol:
kind regards
frazer

fcheslop

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Re: A Wee Wobbler Live Steam
« Reply #6 on: November 17, 2012, 08:14:25 PM »
Another little piccy for Marv,thanks for the information :ThumbsUp:

I know keep the day job :Lol:
Best wishes
frazer

Offline Stilldrillin

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Re: A Wee Wobbler Live Steam
« Reply #7 on: November 17, 2012, 08:52:19 PM »
Frazer.........

                               

It sounds like a bee!  Blummin WELL DONE, that man!  :praise2:

Me eyes have gone all funny now.........    :insane:

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

Offline 90LX_Notch

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Re: A Wee Wobbler Live Steam
« Reply #8 on: November 18, 2012, 02:25:32 PM »
Frazer-

Very well done.  I know what it is like to work at that scale.  This is a very impressive build.  Congrats.

-Bob
Proud Member of MEM

My Engine Videos on YouTube-
http://www.youtube.com/user/Notch90usa/videos

Offline ReFlad

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Re: A Wee Wobbler Live Steam
« Reply #9 on: November 18, 2012, 04:23:46 PM »
Frazer, that is amazing!  Awesome and inspirational!
Ronald

fcheslop

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Re: A Wee Wobbler Live Steam
« Reply #10 on: November 18, 2012, 06:35:58 PM »
Thanks David,I know all about the eye strain :Lol:
Hi Bob, many thanks I remember you're Cracker T build what a cracker.
Thanks Ronald for looking in
kind regards
frazer

Offline V 45

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Re: A Wee Wobbler Live Steam
« Reply #11 on: November 19, 2012, 04:47:58 AM »
That's very very cool !! Great job or your great tiny engine !!
  Dave
Never assume the implied task has been completed !!

Offline arnoldb

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Re: A Wee Wobbler Live Steam
« Reply #12 on: November 20, 2012, 04:59:23 PM »
Very nice Frazer  :praise2: - that's a really small engine!

I like your little pin chuck too  :ThumbsUp:

Kind regards, Arnold
Building an engine takes Patience, Planning, Preparation and Machining.
Procrastination is nearly the same, but it precludes machining.
Thus, an engine will only be built once the procrastination stops and the machining begins!

fcheslop

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Re: A Wee Wobbler Live Steam
« Reply #13 on: November 20, 2012, 09:04:31 PM »
Thanks Dave
Hi Arnold, the pin chuck is summit and nowt but saves a ham fisted beggar like me snapping small drills . I need to make a new one as it starting to wobble a bit just like its owner
Cheers