Problems with my Y-axis
I often have problems with the y-axis during leveling. The self-test is completely ok and also the belt tension is ok. But I noticed, that it happens less often, if the bed is driven "backwards" before the start. If the bed "moves" during leveling, the motor rattles off the Y-axis without noticing the collision. How can this be handled?
RE: Problems with my Y-axis
I am afraid I don't quite understand what you are describing. It "appears" that when the bed moves one direction everything is okay, but moving the other direction it isn't??
Guessing, but a common build problem is when the U-bolts holding the Y bearings are too tight, the bearings are compressed and the balls tend to seize to the rods. The nuts on the U-bolts need to be snug, not tight. Loosen them until the bearings wiggle, then snug the nuts until the bearings no longer move.
Another good test to perform is a self test: then immediately read the "belt tension" numbers on the LCD. Don't adjust anything, just report the numbers.
The belt tension code simply looks at average motor drive currents during the self test. They really are meaningless and say nothing about belt tension. Belt tension must be set using industry standard methods like deflection force or using the sonic method.
RE: Problems with my Y-axis
@tim-m30
Sorry for the long wait. It is very true that the value is not very meaningful. It took me so long to order a fully assembled printer, which I unpacked on the weekend and placed next to it as a reference. The straps are a bit tighter and still the sled glides easier. But it can't be the U-bolts alone, because he printed for a while. In general, I have the impression that the slide cannot be pushed homogeneously, which usually reflects the breaks in the back third.
BUT I simply checked the U-bolts again and put lubricant on the axle and "retracted" and now it works again like lubricated. The value was 240 before and is now higher with 270, but it works. The value hardly changes due to tension or relaxation, if you don't exaggerate it.
Thank you very much for your help.