Z axis loses zero

Did you ever resolve this issue? I'm having the same problem. I touch X,Y,Z Axis . The bit hovers over the material but never cuts anything. The X and Y runs through fine. I've cut things in the past with the machine configured the same way but had to reinstall.

From your description, it sounds like a slipping coupler or the motor not having enough torque to lift the weight of the Z axis. Also double check the setup and hold times in the ini file.

sometimes people also use ESTLCAM with this tiny Zbounces at 0,02mm that breaks of the Zprecision
Take that to Zero in your CAM if you got this Zfreemovement present

Not completely solved but getting closer.

1st win, adjusting the eccentric bearings to ensure the Z carriage was going up with as little resistance as possible. Had to add two washers to push the bottom bearings out further from the carriage that the top two bearings.


Still having zeroing issues, but likely is related to the tool change that seems to always be mentioned the first time I run G-Code (from Fusion 360, using the LinuxCNC output option). I need to dig into this more.

Once I start the Gcode a tool change dialog comes up (not sure why).
After this dialogue it appears the Z axis is no longer zerod. If I attempt to use Touch Off, it does not put the Z axis to 0 but rather .6nnn . Oddly that .6nnn number it goes to is consistent and repeatable. To be clear, when the Touch Off dialogue appears, I do have 0.0 entered. But it does not actually zero the Z access post tool change dialogue. If I instead use the Tool Touch Off, I can zero the Z axis.

Any ideas what I am doing wrong here?

It sounds like you have a tool offset saved and your g-code is loading the tool and offset.