Z axis tilting issue  

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jwirecom109
(@jwirecom109)
Active Member

Having an issue with the two sides not being level.
this is happening during printing and calibration.

Thoughts on why it could be happening?

Posted : 19/01/2021 10:33 pm
jwirecom109
(@jwirecom109)
Active Member

I Have a video of calibration and how badly it goes out

Posted : 19/01/2021 10:34 pm
JoanTabb
(@joantabb)
Moderator

Raise the X axis all the way to the top of the Z axis, until both Z motors stall, and the X axis should become parallel to the bed

the spirit level is n0t a good test
regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 19/01/2021 11:26 pm
jwirecom109
(@jwirecom109)
Active Member

@joantabb

Thanks but that is shown in the video.

 

Both sides are raised to be level.

Afterwhich it lowers starts to calibrate and then tilts

 

 

Posted : 19/01/2021 11:45 pm
JoanTabb
(@joantabb)
Moderator

Unfortunately I could not get the video to work.
One possibility is that the Z motor Bearing covers have been screwed down a little too far, and are jamming...

See Step 3 of the Z axis assembly guide, at https://help.prusa3d.com/en/guide/4-z-axis-assembly_168629

Loosening the covers, and / or Lubing them a tiny bit may help

Have the Linear bearings been lubricated? 
It's difficult to  test smooth movement of the Z axis with the Pom Nuts fastened tot he Z leadscrews.

You could drive the Z axis about 80% of the way up, Support the Extruder, then , undo the screws holding the Pom Nuts in Place, and then try moving the X carriage Up and down, to see if there is any jamming. when finished, re fix the Pom Nuts. 

there is a small possibility that one of the Z motor wires is damaged 
there is a small possibility that one of the Z motors is faulty

I have seen one instance where the X belt Idler mounting screw had been screwed in so far, that it scraped on the main frame. it's unlikely o be an issue, but easy to check... 

Good luck, 
Joan

other than that

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 20/01/2021 5:02 am
jwirecom109
(@jwirecom109)
Active Member
Posted by: @joantabb

Unfortunately I could not get the video to work.
One possibility is that the Z motor Bearing covers have been screwed down a little too far, and are jamming...

See Step 3 of the Z axis assembly guide, at https://help.prusa3d.com/en/guide/4-z-axis-assembly_168629

Loosening the covers, and / or Lubing them a tiny bit may help

Have the Linear bearings been lubricated? 
It's difficult to  test smooth movement of the Z axis with the Pom Nuts fastened tot he Z leadscrews.

You could drive the Z axis about 80% of the way up, Support the Extruder, then , undo the screws holding the Pom Nuts in Place, and then try moving the X carriage Up and down, to see if there is any jamming. when finished, re fix the Pom Nuts. 

there is a small possibility that one of the Z motor wires is damaged 
there is a small possibility that one of the Z motors is faulty

I have seen one instance where the X belt Idler mounting screw had been screwed in so far, that it scraped on the main frame. it's unlikely o be an issue, but easy to check... 

Good luck, 
Joan

other than that

- Have not tried to covers yet, I'll try that today.
- Linear bearings have been removed cleaned and lubricated yes, still the same issue.
- Wires are not damaged.

- both motors do move up and down, there is a possibility that one is moving faster so it could be faulty, hard to test exactly though.
- The X belt idler mounting screw is not scrapping on the main frame

 

 

Posted : 20/01/2021 9:32 am
jwirecom109
(@jwirecom109)
Active Member
Posted by: @joantabb

Unfortunately I could not get the video to work.
One possibility is that the Z motor Bearing covers have been screwed down a little too far, and are jamming...

See Step 3 of the Z axis assembly guide, at https://help.prusa3d.com/en/guide/4-z-axis-assembly_168629

Loosening the covers, and / or Lubing them a tiny bit may help

Have the Linear bearings been lubricated? 
It's difficult to  test smooth movement of the Z axis with the Pom Nuts fastened tot he Z leadscrews.

You could drive the Z axis about 80% of the way up, Support the Extruder, then , undo the screws holding the Pom Nuts in Place, and then try moving the X carriage Up and down, to see if there is any jamming. when finished, re fix the Pom Nuts. 

there is a small possibility that one of the Z motor wires is damaged 
there is a small possibility that one of the Z motors is faulty

I have seen one instance where the X belt Idler mounting screw had been screwed in so far, that it scraped on the main frame. it's unlikely o be an issue, but easy to check... 

Good luck, 
Joan

other than that

Thanks Joan,
looks like it was a cover that was causing the issues.

Posted : 20/01/2021 11:54 am
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