After changing bits and probing Z, the Z is way off?

[Cjd1 (Carl Dombrowik)]

Z Axis Changes During Cut - Onefinity CNC Machines - Onefinity CNC Forum

Z Axis Changes During Cut

The following has happened with gcode from both Fusion 360 and Aspire. While running gcode, the z zero is reset to a much lower setting without any user intervention. I’m talking a half an inch lower. I have cut deeply into my spoil board on a few occasions. Luckily I missed the t-track! I had assumed this was due to some user error (it may still be), but now I’m not so sure. Tonight, I was cutting the Marvel Aztec calendar. I loaded the gcode, zeroed the x y and z, and began cutting. In less t…