Building Rudy Kouhoupt's Fore and Aft Compound

[gerritv]

Time for an update:

Made the bottom/crank end cylinder covers with their bushings. I will have to bore these out to 4mm, my 1/8" reamer cut under size and nothing seams to want to open up the hole in the bronze bushings.

Re-made the CI high pressure sleeve after boring the cyling block oversize. There was a slight delay in progress while I wated for a decent boring head to arrive.

Milled the steam ports in the cylinder block, this went surprisingly well. A 3mm carbide end mill cut like butter. Chain drilling the connecting passages into the cylinders went ok as well. Short split point drill drill, meant no spotting required. After breaking my only 1/16" end mill on finishing the openings I used a dental burr in my Proxxon to finish the passages.

Today I match drilled the holes for mounting the steam boxes etc. Temporarily attached with button shcs, lots of studs to make later.

[gerritv]

Along the way I made a 4 hour detour to make a sine bar. 2.5" long using Stefan Gotteswinter's design from 8 years ago.

It came out to 2.505", I will tweak it later to get it closer once I need a break from the engine, and the garden work , and visitors and ........

[Admiral_dk]

Great progress + Tool 

I wonder if the fourth picture in the first post today shows a major problem 
Should there be a slit all the way through ?

Best wishes

Per         

[gerritv]

Hi Per
There is a slit at top and bottom to let steam in and out of the cylinder via the steam boxes and valve at each end. The middle groove will have a passage to the outside in a later photo.

gerrit

[gerritv]

There will be another gap in posting as we are hosting relatives from overseas.

I did make a 3mm annular cutter, there are a bunch of rod end with M3 threaded ends to make. And it might come in handy to make my own bolts once I get some small hex rod. AliExpress has brass hex down to 3mm, stainless to 5 although I'm sure I saw 3 and 4 as well.

gerrit

[Roger B]

That's a nice little cutter