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I'm building an CNC mill with an Arduino UNO with a CNC Shield V3. But I have a problem with the Y motor direction. It only moves in one way while the X motor is moving both ways. When I just installed everything it worked, but after a view tries it doesn't anymore. I viewed multiple topics on this problem but nothing is working.

  • I tried to switch the stepper drives but that didn't make a difference.

  • Switched the stepper motors and then the x motor moved in one way so it isn't the stepper motor.

  • Tried cloning the Y controller to the 4th connection. Also didn't work.

  • Tried multiple GRBL HEX files, all the same.

  • I also tried multiple gcode senders but is just doesn't make a difference.

Is there anything else that I can try to help this problem? Or shall I order an new shield to test if this shield is broken.

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  • 3
    So, what code is running on the Uno? How exactly is it conected to a motor? Link to the attached CNC shield and it's pinout? Pictures of the setup maybe? Commented Dec 25, 2020 at 15:12
  • 1
    Have you blown one of your drivers? Try swapping them around. Commented Dec 25, 2020 at 16:19
  • if one of the motor windings was not driven, then the motor would fail to turn in either direction ... either the motor driver has a bad direction pin (if there is one), or the problem is caused by software Commented Dec 25, 2020 at 18:23
  • The code is running on the Uno is GRBL and the driver board is A4988, on the cnc shield 3 and i was even trying to interchange the driver and the motor no improvement Commented Dec 25, 2020 at 19:56
  • 2
    Check the DIR signal to the Y controller. Commented Dec 25, 2020 at 21:51

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