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Single-point internal coarse ACME thread in silicon bronze using a hand-ground
tool mounted in a homemade boring bar. I love my job.

Here, too, is yet another reason to do this job as a pair:
Silicon bronze is tough and "gummy" to machine. Cutting this thread
was difficult enough, but doing it as an interrupted cut- as in, machining
just one half nut- would have been a major headache with chatter,
springback, and a hard edge beating the tool out of place.

Doing two, paired like this, allowed me to make a single, conventional
internal thread, eliminating most chatter and almost all springback issues.





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quickest, safest, or even the correct ones. It's up to you to know how to use your own machines and tools.
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