I just discovered, what I think, is a bug in Mach3. I'm hoping someone else can try and confirm this.
When probing for Z zero, after it finds zero, and Z retreats about a 1/8". If you hold Control and press page down (or page up), instead of going down (or up) one step, Z will keep moving downward. Only way to abort is hit the E-Stop. I've broken 2 stylus already with this bug.
If you move the axis without holding the Control, it cancels this bug and start working normally again.
Originally I thought I had a stuck key on my keyboard... but that didn't make sense since Control Page Down should only move in one step per press. Reason I was stepping downward is to confirm the repeatably of the probe.
I like to know if this is a Mach3 bug or maybe it's just my machine/mach3? Hope there is a fix for it... these stylus are expensive!