Issue(s):
- Machine moving inaccurately, too far or too little distance
- Machine consistently moving in the wrong direction
- Z axis dropping or moving down when pressing GoTo XY Zero
Resolution:
- Restore motor-related firmware settings
- DIP switches
- Use Movement Tuning tool
- Adjust Safe Height in CAM software
- Post Processor
Restore motor-related firmware settings
- On gSender, go to Config.
-
At the bottom of the screen, select your machine in the drop down.
- Select Motors at the sidebar.
- Find the follow settings and use the "reset default" button to restore to defaults.
Step direction invert
X-axis travel resolution
Y-axis travel resolution
Z-axis travel resolution
DIP switches
If you have the AltMill, make sure the motors' DIP switches are in the proper positions.
Correct motor DIP switches setting for X and Y-axis, from 1-5: OFF OFF OFF ON ON
Correct motor DIP switches setting for Z-axis, from 1-5: OFF OFF ON ON ON
Use Movement Tuning tool
If you have a third-party machine or you're finding that the movement can be more accurate, you can use gSender's Movement Tuning tool to calibrate specifically for your machine, find it in Tools. Once you finish going through it, turn OFF and ON your controller to ensure the settings take effect.
Adjust Safe Height in CAM software
This specifically addresses the issue: Z-axis Drops when Pressing "go to XY zero"
The Z-axis can move downward unexpectedly if the safe height is changed to something other than 0 and the machine hasn't been homed.
Post Processor
If the machine is cutting inaccurately and you see the error "motion command target is invalid" then most likely you have the wrong post processor selected.
Use the grbl post processor in millimeters.
The error occurs due to how grbl firmware handles arc commands in imperial units.