Gallery, Projects and General > How do I??
help with part holding..
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stirling lad:
I'm wondering if anyone can give me any tips on how to hold these things so i can machine them to the same size on the mill?
And I hope I've managed to figure out this resizing photo's caper! :scratch:
...Mike...





 
Lew_Merrick_PE:
Stirling Lad,

The parts appear to be some kind of shaft support.  My assumption from looking at the photos is that they span some base to which the gap at the base (i.e. the part sitting on the towel) somehow centers the support.  Further assumptions are: (1) that the "shaft" gets a clamp force applied through the bosses on one side of the (assumed) bearing support and (2) that the "faces" of the "bearing supports" are not all that accurately developed in the castings.

The first step that occurs to me is to locate off of the base using some kind of V-type clearance to lock the support frame to the "base" with some means of picking up the (assumed) index surface.  That would allow me to (A) face off the shaft support face and (B) bore the hole for the shaft with respect to the "base" and "index surface."  With that, I would complete the "clamp" that would allow me to locate and clamp the bore to a shaft and, using some kind of support to the side of the A-frame, machine the "base" to the shaft's position.

However, this is all based on an ASS-U-ME position...
vtsteam:
Assuming they look relatively even, I'd probably use the webs of the uprights as a reference by clamping them down, onto a block on the milling table, and square off bottoms of the bases, first. That way I'd know the uprights would stand square instead of tilt.  If they weren't even, I'd shim until satisfied.

Then I'd start using the newly machined bases as my reference plane  to work the rest of the casting.
vtsteam:
I'd use studs blocks and finger (toe?) and cross bar clamps to hold the castings to the block and table, to fully answer your question, since it was about how to clamp work and not necessarily how to align it.

stirling lad:
thanks for your replies guys,,,
the A frames are from atop a Heinricci hot air engine..

My real problem,, the one i can't get around is this main casting block which is the water jacket and top half of
the displacer cylinder, needs a 2" thread cut underneath and a compatible thread cut on the brass ring photo'd
with it...I would then silver solder the rest of the cylinder onto the brass ring ...I have done all the other parts except
these two, (three counting the A frames).. :scratch: :bang:.. the problem is its too big to turn on a mini lathe...and i'm usless at thread cutting as well...but i keep doing the lottery so maybe one day i'll be able to get a bigger lathe,, haha,,,

these photo's are old and most parts have already been done or machined close to finishing sizes...with a little help from
David Drillin...(well,, it is a hot air engine!! :wave:)


It looks like a really tricky thread to cut as there is very little room to do it,,length wise...well it looks difficult to me, but i have'nt really got a clue when it comes to thread cutting..

...Mike..
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