Tiny Vertical Based On G. Britnell's Design

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sbwhart:
Thanks Chaps

Thing have been a bit slow on the shed front over the last couple of weeks, but over the last couple of days I've been easing myself back in :hammer:

Progress on the engine has also been difficult as I've really struggled to make the small M1 pins for the reversing mechanism, the problem was actually turning the bar down to 1mm over the length required and getting the die to pick up and cut a clean thread, when I did get the bar turned the die refused to cut and all I got was a grossly under size thread that the nut wouldn't hold onto.

The answer was to use my thin bar moving steady once I got it set up it worked really well, with that bit sorted the getting the die to cut a good thread was relatively straight forward all I did is turn the part over length as I discovered it was the first start of the thread that was under size all I had to do was cut the thread then cut off the under size bit.

This is the steady in action

The piston valve is experiment part of the design I figured that it would be easier to make than the slide valve, its a simple fabrication from a bit of 1mm brass bar threaded M1 a couple of lock nuts a couple of 3mm*1mm thick washers threaded M1 and a 2mm spacer.

Just got the valve guide and the air intake to make, then I've got to figure out how to set the valve events.

Thanks for watching

Stew

greenie:

No need to try and make that brass bar/rod,-------- for 0.040 inch, or, 1-00mm solid brass bar that's made for threading, it is available quite readily. :doh:

http://www.specialshapes.com/roundsolbars.html

regards greenie

awemawson:
Long way to Chicago though from Cheshire :lol:

vtsteam:
That's looking great, man!

And congrats on solving a really difficult machining problem. :beer:

Stilldrillin:
Nicely, neatly, tinily done, Stew! :clap: :clap:

That's cute! :thumbup:

David D

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