Stupendous Man wrote:
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?

Just today had to try using the cross feed to deepen the threads on
a student job. It is a "turn between centers" (sort of a test) and
with the chuck off to use a center in the spindle it is impossible
to reach far enough, with the compound at 60deg (Clausing/Metosa
have the angles "other way round"), toward the headstock. So I
tried it on the required 3/4 - 16 thread and using .010 infeed
up to .080 and .005 after that ( diameter infeed measure) per pass.
Came out OK. Good sharp HSS bit.
...lew...