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l_tonic

very loud, high pitched sound on the y-axis

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Hello UM-community!

i have a noise problem on the y axis when i'm running the bed leveling wizard

this means when i continue and the printhead moves from the left-front corner to the left-back corner, it makes a very loud sound. (same thing from the right-back corner to the right-front corner)

does anyone have an idea how to solve the problem?

Thank you for coming solutions!

l_tronic

 

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UM Original or UM2? Can you post a video? I think you have to post it somewhere else and link to it maybe. Or gry clicking "gallery" in top left corner of this page and see if you can upload it there and then make a post and click "my media" next to smiley face.

 

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Strange. Well add a drop of light petroleum oil to the axis and push it back and forth over the oil. See if that helps. I think the linear bearing isn't a typical "linear bearing" in that it needs to allow the shaft to rotate also. So it is simply a copper sleeve (I think - maybe - not sure).

If you loosen the 4 screws on top several turns you can probably slide the bearing out and slide it along by itself. Maybe it's being twisted because maybe your UM2 is crooked (was dropped during shipment) and the two rods going through the head aren't square anymore. But that would affect the X also. More likely something with the belts?

All the rods can be (and should occasionally be) oiled. But not the Z screw - that should have grease only.

Any light petroleum oil is fine preferably with no additives (WD40 has additives).

 

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oh you misunderstood me! i dont have an UM2. Only the original.

And i discovered a strange thing: only when the y axis is moving (with the stepper driver) at a high speed it makes this noise and when theres no power i can move the y axis quiet easier than the x axis and also makes a higher pitched sound

 

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oh you misunderstood me! i dont have an UM2. Only the original.

And i discovered a strange thing: only when the y axis is moving (with the stepper driver) at a high speed it makes this noise and when theres no power i can move the y axis quiet easier than the x axis and also makes a higher pitched sound

 

Is it just at certain velocities (around 20-25mm/s)? I have a similar effect on one axis since I changed to direct drive. But I think it's some kind of resonance in my case...

 

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100mm/sec is kind of slow for a travelling speed. It's nice to have a high travelling speed because you are less likely to get stringing as it "breaks" the string. You should be fine at 250mm/sec and slower. 350mm/sec seems too fast but 150mm/sec should be fine.

 

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