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We always check the threads to a thread gage. Had an operator that was suppose to run 10-32 thread and used M5 X .8 tap. It's close enough to the pitch that it wouldn't break but the thread cut over size. The only way it was caught was with the thread gage.
I say it's part dependent. Our lathe parts are very quick and easy basically a steel doughnut. So we program them at the machine it takes no time. Roughing can cycles are the best to use. Want to try more depth of cut, leave more or less stock for finish. these are very easy to change with roughing can cycles.
Face mill I would use a shear hog, for end mills I use MA Ford tuff cut AL endmill line. I haven't found an endmill that can come close. I have ran a 3/8 diameter endmill at 12,000 rpm 400 IPM 3/8's deep in 6061-T6 plate and get approximately 5,000 liner feet of cut from one endmill. I have tried many other brands of endmills but nothing has come close to this endmill.
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