Tiny Vertical Based On G. Britnell's Design

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sbwhart:
Thanks Andrew

On with the crankshaft:- this is made in one piece from a bit of 3/8" mild steel

1st turn up one of the main journals 2.5mm

Then make an eccentric bush by packing out one jaw to give the off set throw.

I drill the bush to take a grub screw to grip the work, it was then a mater of turning up the big end journal 2.5mm with a cranked tool so that I could get up close to the job.

Next I made a split bush to hold the shaft nice and secure to turn up the other main journal

Next using a pair of small vices and three parallels 2*1/8 and 1*1/16 thick mill the counterweight shape on the webs.

Job Done

And this is it after Liz had fitted it into to the main bearings.

:lol:

Cheers

Stew

vtsteam:
I have a hard enough time ruining a 4" long crankshaft blank. That tiny one looks fantastic!

What a cool little engine.

sbwhart:
Decided to make the fly wheel next, so turned up a blank

Then keeping it on the chuck mounted it to the rotary table and centred it under the mill.

Then using the RT to move the angle and the DRO to walk round each segment drill the corner holes.

Then with a 3mm slot drill and again using the RT for the angle and the DRO to walk the segment, cleaned each segment up.

I just tidied everything up with some files and then tilted it in the vice to drill and tap M2 for a clamping grub screw.

Back into the lathe and part off, and then flip it round and got it running true and tidied up the back face.

This is it after Liz had fitted it to the engine :)

Stew

ImIndoors:
Great stuff Stew. As always I'm picking up tips from your build log and full of admiration of this tiny project.
I take that Liz is on the Minnie Mum wage? :clap:
Jim

micktoon:
Cracking post Stew , small engines not really my thing but real good project so I have enjoyed and learnt from it :thumbup: Thanks for posting :clap:

Cheers Mick

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