Adrian wrote:How is the Z driven? Could be a damaged tooth if it's a pinion or toothed belt.
martin54 wrote:What sort of motor have you fitted to it? if the motor shaft sticks out the top of the motor casing then it is easy enough to wind the axis up & down with no power on the machine. your z axis should move up & down with ease if the shaft is turned so finding any spots that are causing any kind of binding or any damage to the thread can easily be found.
If the end of the motor is closed then you would probably need to remove the motor to turn by hand as it is unlikely you will have sufficient access to turn the lead screw by hand.
This happens every once in a while with me. The problem is the mill will bind for whatever reason and throw the G-Code out of sequence vs. the correct position of zero.
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