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Rory schrieb: They are bits left over from the brass manufacturing. They serve no purpose.
Backlash is movement/play in the drive system as the motor changes direction.
Your talking about the machine stiffness from the slides? So you are pulling the brass roller onto the Aluminium channel. You need to it to be so that the movement is "just" gone. but the slides still move. you should be able to get the slides to move freely with no play. Ignore the 1kg bit - just feel it - just enough to tighten. you can tighten them more at the end.
you want good clean easy movement with good overall machine stiffness.
Rory schrieb: Jerky movement on Y axis? Make sure the two portal towers are the same distance from the back of machine - and the pulleys are working together and are both solid.
Are you using Mach3?
tikka schrieb: ... I measured the distance from the end plate to the portals with a calliper before and after the assembly. The difference between the portals was about 0,03mm. My measuring error is probably larger than this value so the actual difference could be more.
... I purchased a dial indicator for backlash measurement and I could also slide it along the X axis (actually Y axis now since I swapped the pins) to see how the pointer moves. The problem is that I don`t have any calibrated metal blocks to slide it on.