I have a job coming up with a 14.750-32 thread and I need pitch tolerances for this, or even better, a formula to figure this for other jobs. Also, any smart suggestions on how to measure pitch. I know I can measure over wires(what size?). There is a 13.6885 dia counterbore also, what about using a pin mic over the wire? Any help is appreciated.
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02-26-2012, 06:05 AM #1
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How to figure pitch tolerances for large threads?
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02-26-2012, 02:25 PM #2
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pitch tolerance
Sometimes the customer will give you the high and low on the print. A call generally will resolve the mystery. My old stand by is the machinist hand book.
It gives you the high and lows for max and min sizes for all threads.
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02-26-2012, 06:02 PM #3
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Here are a couple of charts from Machinery's Handbook to get you started.
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03-01-2012, 11:06 PM #4
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THREADING
If I remember correctly a rule of thumb for a 75% thread is
1 inch devided by # of threads = Double depth of thread
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