If I leave the THC speed below 28IPM It seems to work . that's probably fine for flat stuff, I'm more worried about cutting thinner materials at high speed...N
The other issue you'll have with a THC using Mach3 inputs is bouncing. Because there is no acceleration...or deceleration applied, the axis will always overshoot a little when your THC turns off the output. This causes it to read high...or low, and correct in the opposite direction. That continues causing a sine wave cycle. The higher the THC feedrate, the worse it is. You can minimize the effect by programming a "dead zone" in the THC. That would basically stop the Z motor before your actual set point. If it's set right, the axis would stop right n the set point. The downside to a dead zone is that as increase it, you lose sensitivity.