[QUOTE=ngwagwa;115630]
Quote Originally Posted by JAZZCNC View Post
It would be a mistake not to check it out.

BINGO and thanks to JAZZCNC. Disconnected the drives nuts and jogged for about 10 minutes with no knocking noises, gave them a liberal spray of silicone lubricant, reassembled and all seems sweet.

So, is it possible to replace the stepper motor with one with a bit more gut? I can't see any markings on the current ones.
Great glad your sorted.

Regards changing the steppers then often with these machnes if using original boards then it's not the steppers that are weak it's the fact they are run with low voltage drives, usualy between 30-40Vdc depending on model. Changing the steppers alone won't make any difference because the drives and voltage are the weak link.

Are you using the original drives etc that came with the machine.?