I moved my spindle to create a greater cut distance for a project. I loaded a cutter and lowered the Z axis to zero the tip and found I was a few millimetres short of touch down the axis stopped in Z mechanically. I tried to raise it but it wouldn't move. Trying to move in X and Y was a problem it was incredibly slow about one revolution of the lead screw in about a minute. I was able to move the axis to Home position and it moved normally. But trying to move with controller in 10mm steps gave the same problem. I disconnected and shut everything down Rebooted and tried again same problem very slow movement on axis. I am not sure what I need to do to fix it. The z axis created the issue by trying to go beyond its mechanical limit. Is the Z axis the one I need to concentrate on?
With the power off, disconnect the Z motor. Make sure wires can't touch if they are not in a connector plug. Power on and try X and Y axes. If they now work power off and check the resistance of the Z motor coils. The readings should be low but identical. For reference you could also check the resistance of one of the other motors. Let us know what you find. Alex. PS it would be helpful to know what controller you have.
1.2 ohms and 1.3 ohms across the coils checked for isolation between coils seems fine. Disconnected Z powered up the cnc still has the same problem
Thank you so much silly me. I have been in hospital and have not used the machine for several months. I need to re-acquaint myself with the workings. Once again thanks
