Z axis shaft bended?

Hi. 

I have a problem with a clicking sound from the lower bearing of the z axis. I didnt have any problematic printings so far but this sound is very frustrating. I desided to loose the four screws that holds the lower bearing to the body of the printer and I move the platform up and down to find that there is no more sound from the bearing but the bearing moves left and right when the shaft is turning. It seems that the shaft is bended and causes stress to the bearing every time it turns.

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What about the screws that hold the ball screw to the platform? Those are supposed to be loose to allow this movement to account for non-straight Z-axis rod. If those are tight then there will be stress on the end bearing(s). X-Y movement of the ball screw is OK.

What about the screws that hold the ball screw to the platform? Those are supposed to be loose to allow this movement to account for non-straight Z-axis rod. If those are tight then there will be stress on the end bearing(s). X-Y movement of the ball screw is OK.

These screws were loose too. I tried to tighten them to see if this was the problem but no the problem comes from the bottom bearing, as soon as I untighten the four M6 screws of the bottom bearing the clicking sound disappears. At least there's no negative effect in printing quality with the bottom bearing untightened so far. I have printed three objects and every one is perfect.

Finally I decided to try another option as I didnt like the idea of having the lower bearing untighten. Firstly I untight all the screws from the hole assemply including both upper and bottom bearings, ball screw on the platform and the two screws that hold the stepper, then I turned the shaft by hand all the way down and up and begin tightening the screws of the upper bearing first, the four screws on the ball screw of the platform (these not to tight but to the point that they were not vibrating with a finger touch) then the four screws on the bottom bearing and finally the two screws that hold the stepper to its base. Well its a kind of magic but there is no noises anymore and all screws except the four in the platform are tightened well enough. I performed a platform calibration to get a result of absolute zeros to all points and this makes me more than satisfied. Back to busyness  ^_^

 

Well done! Now you are qualified for a job on the Zortrax assembly line :)

Well done! Now you are qualified for a job on the Zortrax assembly line :)

Hahah I appreciate the offer but I'm allready working in a Zortrax reseller   :P