Grinding sound while x-axis is moving extruder  

Re: Grinding sound while x-axis is moving extruder

Note: Just made the video public

Re: Grinding sound while x-axis is moving extruder

1st: disable steppers (through the menue) and move the extruder carriage (in x-direction) and the printbed (in y-direction) manually.
do you feel any blocking ???

2nd: check the pulleyes at both steppers (x-motor, y-motor). it sounds as if either the belt or the pulleye slips.

3rd: check the belts tension.

4th: what happens if you move the axis through the settings menue ? do you hear the grinding sound as well ?

5th: check the y-endstop switch !

6th: install firmware 3.0.10 and invoke the pulleye test (think it's part of the selftest).

Re: Grinding sound while x-axis is moving extruder

From your instructions (comments in line):

1st: disable steppers (through the menue) and move the extruder carriage (in x-direction) and the printbed (in y-direction) manually.
do you feel any blocking ???
* No problem here, no blocking

2nd: check the pulleyes at both steppers (x-motor, y-motor). it sounds as if either the belt or the pulleye slips.
*

3rd: check the belts tension.
* Belt pings as suggested in instructions

4th: what happens if you move the axis through the settings menue ? do you hear the grinding sound as well ?
* Moves about freely with no issue

5th: check the y-endstop switch !
* No problems here

6th: install firmware 3.0.10 and invoke the pulleye test (think it's part of the selftest).
* Here is where I'm getting good information from the firmware update. During the selftest I now get this error: Loose pulley motor.

I'll try inspecting everything again on the pulley motors but still not sure exactly what to do in order to fix this.
Thanks,
Tom

Re: Grinding sound while x-axis is moving extruder

on my mk1 the X axis idler bearing collapsed and made a lot of noise.. maybe you could check that?
regards joan

Re: Grinding sound while x-axis is moving extruder

It almost looks like the motor itself chokes up, not slipping.
Videos of different views (Slow mo):
Motor View:
Rear View:
Front-Side View:

Tom

Re: Grinding sound while x-axis is moving extruder

you can swap the y an x steppers temporarily, they are both the same type of motor. so you can at least check that its the motor (and not a bad connector or a defective driver circuit).

Re: Grinding sound while x-axis is moving extruder

We are having the same problem in my company with our new Prusa3D MK2.
Calibration fails because of the Loose Pulley Motor X issue.
I have now started calibration of the XYZ axis, avoiding the selftest, and it has calibrated the 4 of 4 points without issues and now it is improving the bed calibration without any issues.

Could it be a firmware issue at this point?

Cheers,
e.

Re: Grinding sound while x-axis is moving extruder

You can definitely succeed at calibrating and even printing if the pulley and/or belt are not "right", bet eventually it'll slip and ruin a print.

Making sure you can pass the self test is in your best interests.

Re: Grinding sound while x-axis is moving extruder

I fixed it!

Turns out the X-Axis pulley system was too tight which threw basically everything off. I loosened it (by a lot) and now I'm 70% done with my first print.
Perhaps the instructions shouldn't say "you should head a ping sound" but just tight enough where there is no slack.

Tom

Re: Grinding sound while x-axis is moving extruder

What do you mean you lossened up the X axis pulley system?
What exactly did you loosen up? the belt?

I tried that but it made no difference.

Re: Grinding sound while x-axis is moving extruder

Correct, I loosened the belt... A lot.