Runaway Z Axis on home button

[MartyG (Martin Grant)]

Hey guys, Need some advice with a problem setting up my GRBL 3018 CNC with Lightburn. The Y & X Axis work fine but I’m using a Diode 2.5w laser and don’t need the Z Axis but when I hit the home button the Z Axis travels all the way to the top so have to turn of machine as don’t have limit switches. I can then manually wind the Z Axis back down but then when I turn it back on it continues trying to travel up causing ne to turn it off again. Turn it back on again the Z stays in place but will do it all over again If the home button pushed. When doing this I moved to Y or X but when home pushed it only moves Z Axis. I use the machine with a spindle to machine Acrylic panels and it worked flawlessly & used it with laser using GRBL Laser with no problems. Thanks for any help. I searched the forums but couldn’t find anything similar. Cheers

[justginbg (Gary Rowlands)]

Please try searching

Grbl z axis commands

Or similar in the forum search box. To here are many entries that might assist

Fingers crossed for luck

Regards

Gary

[Rick (Technical Evangelist)]

@MartyG

GRBL 3018 CNC with Lightburn

This might help and would be worth reviewing:

Configuring a 3018 CNC (or other CNC-based laser) for use with LightBurn

The summary: Turn on Laser Mode to get rid of the travel lines You’re trying to move too fast, which is why you don’t get enough power You need to zero the machine 3018’s are pre-configured for use as CNC machines, not lasers, so their settings and speeds will likely need to be changed to give you acceptable results with LightBurn. To see the existing settings, you can type $$ into the console in LightBurn and press enter, or go to Edit > Machine Settings. Both are showing the same values, b…

[MartyG (Martin Grant)]

Cheers for that Rick, Will check it out.