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Originally Posted by CommanderKenyon

I've just got a 6040 and having problems with x axis managed to get things moving in Mach 3 rest of axis are fine but x moves in random directions and sometimes don't move just make humming noise with no motor movement atall

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Guess, Wiring from control to motor fracturing, its amazingly brittle, or the TB driver giving up.

Swap X&Y axis plugs over and see which axis gets the problem?

Quote:

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Originally Posted by CommanderKenyon

I've just got a 6040 and having problems with x axis managed to get things moving in Mach 3 rest of axis are fine but x moves in random directions and sometimes don't move just make humming noise with no motor movement atall

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It will be a loose connection to the Direction pin on the board or plug it's a common thing. That or the wire as break in it like MushT suggests as the wires are poor quality.