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July 8, 2018, 08:22 AM | #1 | |
Staff
Join Date: November 2, 1998
Location: Colorado
Posts: 21,831
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How does a Blanchard Lathe/stock duplicator go wrong?
I lifted this from Arfcom. Apparently this stock was defective and remedied. For a "batch" of stocks to go wrong, something had to be wrong with the Blanchard lathe? Workpiece not tightened in the rear? I don't think it could be the pattern (why would anyone put a bad pattern on a Blanchard Lathe?). Thoughts?
Quote:
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July 8, 2018, 09:42 AM | #2 | |
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Join Date: November 2, 1998
Location: Colorado
Posts: 21,831
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More from Arfcom
From another post there:
Quote:
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July 8, 2018, 11:34 AM | #3 |
Senior Member
Join Date: November 13, 2006
Posts: 8,283
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I don't have experience with a Blanchard Stock machine.
I have some limited experience with a tracer mill. Assuming the cutter is a ball mill,in theory the stylus would have the same radius as the ball mill. However,that may not give the desired results. As I recall,there was a small amount of stylus deflection necessary for the hydraulic servos to react. And often some finishing stock was desired. The simple fix might be compensating with the stylus. Example,we might try a .250 radius stylus for a .500 dia ball mill. Our workpiece might be undersize by .015 material per side . So we can compensate by making a .265 radius stylus. |
July 8, 2018, 12:21 PM | #4 |
Senior Member
Join Date: February 13, 2002
Location: Canada
Posts: 12,453
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"...wrong with the Blanchard lathe?..." It's more likely that one was an arsenal repair(lotta talented guys working there) rather than out of the factory like that. The Blanchard lathe held the stock blank on the end. Wouldn't have been able to do that with that stock if the blank was that short. Any stock duplicator lathe does that.
There's a link to a video of a Blanchard in action here. https://www.nps.gov/spar/learn/histo...e/machines.htm
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