Faceplate and angle-plate won't play together

[jack620]

Hi Phil,
I have a wobbler. That wasn't the problem. The problem was that once I had the crankcase centred in one axis I would throw it out of centre when I tried to centre the other axis. I have now successfully bored one of the crankcases using the 4 jaw and my ali jig. Used the wobbler to centre it. Pics to follow.
Chris

[jack620]

Thanks for all the help folks. Here are some pics of what I've done so far.

[Steamwhisperer]

Outstanding Chris.
I have a big admiration for people who can machine to those tolerances. I have nearly assembled all the castings for a Stuart Turner 5A steam engine...I thought that was small!!
Well done again. As they say"where there's a will...there's relatives"

Phil

[jack620]

Thanks Phil. It's been a very steep learning curve. What has surprised (or dismayed) me is how a tiny tweak of the crossfeed dial can make a tight fit into a loose one. I should set the compound at 5.75 degrees and use the 1:10 method, but I always seem to forget.

The real close tolerance work comes next when I have to lap the cylinder and piston with diamond paste. That stage is more art than science. Because this is a 'diesel' engine it requires a very close fit between piston and bore or it won't fire. I really should have started with a glow plug engine which are less critical for fit. Too late now.

Regarding wills- I think my parents have joined a SKI Club (Spend Kids' Inheritance).

Chris

[Ueee]

Nice work Chris.

There is an Audi s6 that gets around locally with the number plate KISS. But its not keep it simple stupid, it says above the letters "kids inheritance spending spree"