Problem with sticky Y motor
If I remove the Y motor I can slide the bed back and forth very smoothly.
If put the motor back, there is a bit of normal resistance from the motor, but the resistance isn't even. The motor sticks slightly once every revolution.
Is this normal, or is it a sign of a bad motor? None of the other motors have the same problem. The belt tension is fairly low.
With the printer was a page saying there is a customer support 24/7 LiveChat, but I can't find it. When I click on Contact all I see is a contact form, no telephone number, and when I fill in the form it says there is a captcha error, but there is no way to do the captcha.
Regards,
Bjorn
RE: Problem with sticky Y motor
The chat shows up in the lower right corner of Eshop.
You have to be logged in. Than it will show after a few seconds.
Some times it is blocked by addblockers.
Do you feel the same sticky spot when you turn the motor by hand?
RE: Problem with sticky Y motor
@baklin
Thanks. No I can't feel it when I turn the motor by hand. First I though it was because the belt was too tight, so I tried to really loosen up the belt up to a point where it starts skipping from the motor, but still the same effect. I also looked at the belt bearing on the other side and it looks and feels fine. Very strange.
RE: Problem with sticky Y motor
Think about checking your pulley - once around tightness may be the grub screw is not seated on the shaft squarely, or your belts just might be way too tight. Get some prusament PETG and then download the belt tension gauge for your printer from the print library. They are calibrated for prusament PETG and will give false readings if printed in any other PETG (I've tested that to be true).
RE: Problem with sticky Y motor
A stepper should turn 360 degrees without any change in the force as you rotate it. If you are feeling a bad spot - a sticky spot - when the motor is disconnected and spinning in free air, it is very likely bad - either bad from the factory or damaged. You can go one further and short the windings, and see if the stickiness changes. It will be more difficult to spin the motor, but may point to mechanical versus bad windings.
RE: Problem with sticky Y motor
Thanks for all replies. The problem went away, and I'm not sure why. I swapped motors, then swapped back and now everything works fine. Maybe some small detail was misaligned, but hard to see what it could have been.
RE: Problem with sticky Y motor
@bjornm
That is good news. Sometimes problems just go away.
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Chuck H
3D Printer Review Blog
RE: Problem with sticky Y motor
@bjornm
There's a chance simply working the motor around dislodged something inside, a burr, or that unplugging wires and putting them back cleaned up a connection that was misbehaving. You might write down what you did that "might" have fixed it so that if it comes back, you have a good place to start the next diagnostic session..
RE: Problem with sticky Y motor
I had the same problem with my newly assembled MK4: higher resistance of the y-axis synchronized with the revolution of the stepper motor. I was afraid that the axis of the motor had a tilt. I disassembled the pulley and recognized directly that there was something wrong. During the fixing of the screws (that one that is going to the round part of the axis and not on the flat) i created some scratches. By optimizing the position of the pulley those scratches caused a tilt of the pulley. After cleaning everything and sanding the axis (very fine sand paper) everything was smooth and the failure gone.