Fast wear of Y-axis ildugur bearings

Hi, after having assembled the k8400 and making beautiful prints for about 30hrs. I noticed a ticking of the printer when it changes Y-direction. Examination revealed wear of the ildugur bearings. Same bearings on the X-axis don’t have this kind of wear. System was always lubricated…

I’m aware of that the extruder rods +guide blocks to be correct aligned with XY rods. XY guiding rods are perfectly aligned with the bearings in the enclusure(with mounted extruder of course), they go in without any force.

Strange thing is that X-direction has less resistance when I move it by hand then Y-direction; which suggests mis-alignment.

However the increased resistance in the Y-direction is only at the back of the printer, front and middle are ok. Therefore I assume it can’t be an incorrect lenght of the extruder rod.

What could this be?

[quote=“TLS”]However the increased resistance in the Y-direction is only at the back of the printer, front and middle are ok. Therefore I assume it can’t be an incorrect lenght of the extruder rod.[/quote]Actually it probably is. Try knocking the clamp a bit further.

when I remove the endcaps, loosen the pulleys and belts, and slide the XY guiding rod just out of the enclosure bearing; it’s perfectly co-axial with the bearing. Therefore I think the extruder rods have the correct length. With incorrect length the movement should be difficult front and back, no? I only have more resistance at the back of the printer.

I printed the two calibration clamps as suggested here:
k8xxx-3dprinters.crimed.be/w … _Alignment

and made correct alignment… Resistance in the Y-direction is fearly even now, but still stiffer then X-direction.

Raby, does your printer also have more resistance in the Y-direction then X-axis?

update: higher resistance movement in the Y-axis was due to more tight primary drive belt.
I’m suite sure my problem was bad calibration of the pulley system.

In my opinion Vertex should supply these calibration clamps as part of the kit, with a lineal or caliper -as suggested in the assembly manual- i’ts close to impossible to get the alignment spot-on.

Correct alignment of the axis assembly is indeed mandatory to get a functional printer. Glad to hear you achieved it :).

Interesting question, I did not check both sides. but suppose there is a misalignment on one side while the other side is aligned, there’s no real way of correcting this, no?

But the alignment issue is solves, I think eveeryone needs to align his printer via the calibration parts from the wiki page.