GRBL Loosing Zero Point between Passes

[AndyUK]

Hi Rob,

Try the cut in air. If it keeps the zero that will tell you it's not GRBL. If it still does it I'd suggest it's potentially an electrical interference issue, otherwise it's potentially just pushing the machine too hard and dropping steps / mechanical slippage eg a grub screw not being tight enough (I noticed you have a number of pulleys and belts - make sure everything is appropriately tight but don't over tension the belts). Interference is still a possibility (the current in the spindle and motor wires will be higher when actually pushing through material) but it's the less likely bet if the in air cut works.

By the way - just seen your Instagram page from another thread. Some beautiful work!