I would face one end of the cylinder, reverse it in the chuck with the faced end pressed against the chuck face, and face the other end. Bore the cylinder without taking it out of the chuck. This makes the bore at 90¡ã with both ends. Now hold it by the ends in the vise, & mill the flat.
Mert
mertbaker@...
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----- Original Message -----
From: Edward Wilks
To: unimat@...
Sent: Sunday, January 28, 2007 12:38 AM
Subject: [UNIMAT] help on pm research model 2A/2B steam engine
I am trying my first real project on my unimat, a PM Research Inc. model 2A/ 2B steam engine. An oscillating engine.
The Flywheel was relatively easy, but the cylinder barrel presents some problems.
First: which face should be done first? Seems like the face that meets with the frame should be first. But, if so, what is the best way to hold it while the milling is done.Trying to keep the face square with the cylinder and the bore presents quite a problem. I think I have the cylinder mounted so the bore and face are parallel within 0.003 inches, is that ok?
Second:Keeping the ends square with the bore and the frame mating surface also presents a hold-down problem.
I hope I am making sense. Any help will be appreciated.
Ed Wilks
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