That worry kinda goes away if you grind an accurate Acme profile and feed straight in, slowly.

Bob Swinney
"Ed Huntress" wrote in message ...

"BillMe" wrote in message
...
I need to cut an acme thread in a steel block. Roughly 5/8" X 6. I
forget what I measured! Is that done with a tap or a boring bar?
Friends have not heard of an acme tap. Thought someone might know.

Thanks,

Bill A

There are such taps. I have one, 1/2" x 10 Acme.

Boring a female Acme thread is something I've never tried. I still scratch
my head over single-point turning of *external* Acme threads. Some of the
old books tell you to cut both flanks at once, but I've never figured out
why. I made a couple of Acme threaded shafts in 1/2" x 10, and cutting on
one flank, just scraping the other, seemed to work Ok.

--
Ed Huntress