replaced x axis stepper motor, now it jiggles back and forth super fast

[lance-greene 7]

so my x axis stepper motor failed, i got a new one from robokits in new zealand that is the exact same as the ultimaker one and replaced it, i had some belt alignment issues but fixed them.

now when i run a part, as soon as it starts printing it jiggles very heavily and is entirely unprintable. the cable for the motor was too short so i cut some extra off the old stepper motor and soldered them together, connecting the cables all with the same color wires, then put electrical tape on the soldered points to keep them from touching.

i dont know what the problem could be, is something wrong with the firmware controlling the motor maybe? i dont know.

[Torgeir 242]

Hi Lance,

This problem might be a wobbling pulley.

As I built my printer, I've got a few pulleys that’s had to go to the bin! They wobbled way too much.

However, I found they was drilled and had offset and was oval on one side.

I made some shims, to put on the side where there is no set screw, in this way it was possible to correct. However, in your case you may have a warranty that’s still valid, so no problem...

Well just for your info.

Regards

Torgeir.

Edited May 17, 2016 by Guest

[lance-greene 7]

i dont think this is the issue, ive never had this problem before, the only new thing is the motor. all the pullys are the same as before

[Torgeir 242]

Hi Lance,

Did'nt you turn the pulley on the x-stepper motor?

Some steppers have a flat part and some not, so if you turn around the pulley -things change.

The thing is; does your pulley jump up and down?

Of course, the shaft might be bended.

Just my two pence.

Good Luck.

Torgeir.

[lance-greene 7]

i solved the issue.

when i spliced the connector to extend the length of the wires, the connector i used was from a stepper motor for a different printer we have, its connections within that connector were positioned differently than the ultimaker and signals were being crossed. i corrected this and it prints perfectly now.