Tiny Vertical Based On G. Britnell's Design

[b.lindsey]

When working on such small parts, 4 hands (6 counts yours as well as Jack and Liz's) can often be quite helpful You are making some great progress on this one Stew, I am really enjoying the set-ups and pictures!!

Bill

[sbwhart]

Thanks Bill

I've only just realised that I've missed off some features from two of the parts 

Putting that right will be my next job.

In the mean time I've completed some more parts the main bearings.

Again I started by turning and drilling a blank on the lathe.

Then manipulating it in the spin indexer mill it to shape.



The drill the holes.



Then back onto the lathe for parting off



I've used a catch wire to stop the part flicking off disappearing to be collected by the shop GREMLINS 

These are the finished parts



Cheers

Stew

[sbwhart]

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.

 



Cheers

Stew

[sshire]

Stew
All is looking quite excellent. The machining of these tiny parts is wonderful. It seemed I'd been making smaller and smaller engines and then went the other way with the Rider-Ericsson and the Farm Boy. Just larger bits of metal to scrap.
Watching with great interest.

[gbritnell]

It's coming along great Stew. It looks like you have the machining of these small parts mastered. It does take some ingenuity to clamp and hold these things.
gbritnell

[b.lindsey]

Very nice Stew, and my compliments to Liz too for her fitting skills

Bill

[Stilldrillin]

Have you tried watchmaking, Stew? 

Blummin, well done! 

So far....... 

David D

[crueby]

That crankshaft sequence is fantastic - wonderful work!!
 

[Roger B]

Excellent    Did you machine the complete big end journal with that full width offset tool?

[sbwhart]

Thanks for your interest chaps.

It's coming along great Stew. It looks like you have the machining of these small parts mastered. It does take some ingenuity to clamp and hold these things.
gbritnell

I have you to thank for the ingenuity George 

Excellent    Did you machine the complete big end journal with that full width offset tool?

Yes Roger I just ground the tool up to give me the required width then made sure it was set flat on the work, I'm using leaded free cutting mild steel so it cut like a knife through hot butter.

Cheers

Stew

[SHOPGUY]

Nicely done.
Something to aspire to.
Ernie J.

[Bearcar1]

BRAVO! Stew!!! I always admire your work and I am sorry for being late to the party…… Carry on….

[Don1966]

Stew I have been following quietly but I have to chime in that is some awesome work.

Don

[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

[sbwhart]

Now for the connecting rod:-

A chunk of 10mm brass bar was first roughed out in the spin-indexer.



Then using a 2mm slot drill mill little end fork and drill.

I also marked the position of the big end split line and the position of the bore with a spotting drill to aid alignment for later ops.



The onto the lathe for turning down the middle, and parting off.



Gripping it square in a small vice and lining up on the part off pip and the spot marks zero DRO.



Drill M1 tapping.



Cut off the bearing cap again using the spot marks to get position.



With the cap cut off tap M1

Then open up cap to M1 clearance 1.2mm



Screw the cap to the rod and set up on centre and drill 2.5mm.



Job Done





Stew