I have a problem with my arduino grbl cnc project. I have a big old japanese milling machine which I am going to upgrade with cnc controls. Machines X, Y and Z movements run with hydraulic power, but they are controller with quite small stepper motors. My plan is to replace old stepper motors with nema17 size steppers and control them with arduino based cnc shield. Actual problem comes with Z-axis. There is mechanical brake to hold Z-axis position. So I need to get an control signal from arduino/cnc shield to release the brake when Z-axis is in operation. I am not using spindle control so there is free channel, but how can I change the function of this output?
This question seem to be entirely related to the GRBL software, Arduino users here are unlikely to know unless they also happen to be knowledgeable about specifics of GRBL.
Have you tried asking on a more focused forum, such as GRBL - V1 Engineering Forum ?
OK, I will try that forum.
Thanks
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