cvoinescu wrote:This can happen if the motor shafts aren't perfectly aligned with the holes in the nuts connected to the X axis. Try to loosen the screws holding the brackets to the aluminum profile, lower the Z as far as it will go, then carefully tighten the brackets in that position. Verify that it moves freely all the way up and down. Depending on the type of nut, it may help to loosen the nuts too when the Z is all the way down, then re-tighten them.
When in doubt, lubricate!
orcinus wrote:The easiest way to align your rods is to put your ORD Bot on a flat, level surface, then prop the X gantry some way up (e.g. Z = 150ish cm).
Now loosen the adapter set screws and unscrew one of the rods until it's just above the adapter and let it "hang" off the nut.
Now unscrew the Z stepper plate and align the adapter hole with the rod, retighten the stepper plate, screw down the rod and tighten the set screw. Rinse and repeat for the other side.
Finally, don't forget the Hyneman's law:When in doubt, lubricate!
orcinus wrote:1. "adapter" = the thing connecting your threaded rod to the stepper motor shaft
2. "set screws" = whatever is holding the threaded rod and the stepper motor shaft in the adapter (the early versions had set screws, flexible couplers usually don't have set screws, but screws that clamp the adapter to the shaft and rod)
3. "nuts" = the things attached to the X gantry, through which rods screw and convert rotation into translation of the Z axis
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