"Stupendous Man" wrote in message
...
I have a lot of 2 inch by 8 TPI internal threads to cut in cast aluminum,
both left and right hand, and just got the missing parts for an "on end"
style bar thats been in the cabinet for years. I remember someone saying
that they prefer leave the compound 29 degree angle out of it and just use
the cross feed.
Hows that compare to the traditional method for smooth threads?
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty

When you cut threads by feeding straight in, you're cutting both flanks of
the thread at once. That produces twice the tool load for a given depth of
cut.

If you have a good lathe, your tools are sharp, and you're cutting aluminum,
it may work just fine. But cutting clean internal threads depends on getting
things pretty close to right, so the extra tool load is something to watch
out for if you get some chatter.

--
Ed Huntress