[RussMachine]

I remember reading in the TORMACH user's manual that Mach3 doesn't actually support Cutter Comp (G41, G42)
Do any of you guys have hands-on experience using Cutter Comp on your Tormach's?
Does it work?
I'm still waiting for my Threadmill to arrive, and I know I'll need cut-comp to fine tune the final thread fit.

[ger21]

Not with a Tormach, but I use comp all the time with Mach3 on my router.
The reason that Tormach doesn't support it, is because it's buggy, and they don't want the aggravation of dealing with it (imo).
It doesn't always work well in subs, and using multiple offsets may also be problematic. Depending on the version of Mach3 your using, you may see a different behavior than you would in a different version.

For basic profile cutting, it works 99% of the time for me. But I have seen it just not want to work correctly with certain geometry.

[RussMachine]

I guess it would work for threadmilling, since there aren't any abrupt changes in direction.
Just a steady clockwise helix.

[IMT]

I use cutter comp sparingly, only for very tight toleranced features. I use at least a one full diameter move when turning it on and off. Also don't use a radius that is too close to the cutter radius or it can get confused.

For thread milling I use a macro I wrote that uses the tool diameter specified in the tool table and adjusts accordingly.

-Dan

[RussMachine]

I just finished my NPT project.
YES, cutter comp DOES work in Mach3.
It can be a bit cranky if your approach is wanky, or if it's smaller than the radius set in 'D'
But it does work.
I spent almost all day tweeking it, and found that it likes the 'G41' on it's own line before the 'approach' move.
THEN move into your actual cutting path.
So I added a dummy move to get the Cut Comp activated.
No problems with OD and ID threadmilling.
SCORE!!!