Robin S. wrote:

I find that I can get excellent threads (comparatively) by setting up the
compound parallel to the longitudinal travel. You have to calculate the
depth of thread to go in (I think it's pitch * .6495, in radius, double the
value if your machine is in diameter).

Once you have threaded to this depth (the thread will look incorrect),
retract the compound about .001" and take a pass. Then advance the compound
roughly .002" past your original zero and take another pass. Use thread
measuring wires for the best fit, but you can just muck about with a nut if
you want.

This technique works so well because it independently cuts the leading and
trailing flanks.

I have found the surface grinding the top face of the cutter makes for an
excellent finish. I would assume grinding the side faces couldn't hurt
either.

I'll give it a try tonight. Thanks.