Ed,
Alumnium or brass?
My opinion, my first project but it was a disaster as alumnium is unforgiving and have to buy replacement.
First use a file to get castings close to specs.
Pieces like the cylinder use file and square on the three surfaces. You should be able to put in three jaw chuck face one end then reverse and face/bore the other.
With the standard I tried to drill the conventional way but may be easier to bolt to carriage on the lathe and feed into the headstock.
Writing this fast so take it with a grain of salt and see if it will work, do some dry runs without cutting.
Ransome
Edward Wilks <wenowork@...> wrote:
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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