[gateman]

I just replaced my gantry on my 4x6 router, and now the timing belt is walking towards the motor. It is the exact same setup as before, just on a different gantry. It worked perfect before. Pulley has perfect alignment with idlers. Cant seem to figure this out, knowing (I thought) that a walking belt is caused by incorrect alignment.
any thoughts?
Stepper belt walking - YouTube

[Phife]

Either some sort of misalignment or your tension isnt set correctly is my guess.

[gateman]

Would too tight or too loose cause this?

[RTP_Burnsville]

My guess is that the shaft of your motor is not parallel with the shaft of what is being driven. The belt then walks to a position which it thinks is the largest diameter of the pulley. Not sure how else to explain it with out making a sketch. If you draw the shafts and pulley greatly misaligned you should be able to see what I am babbling about.

Robert

[gateman]

The only pulley is on the shaft.

[HorridHenry]

From what I can see from the begining of the vid before the motor kicks in,your belt is at a slight angle and this will give rise to belt shift on the pully.