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Last updated: 08/13/20108
Rev. 9
Thread the ACME through the anti-backlash nut, then slide the lock collar, bearing, and shim over the
top. Attach one of the black plates on the top of the Z via the supplied M5 x 25mm bolts. Feed the Z
gantry down through the wheels in the front of the X axis. Continue to slide down until there is enough
ACME hanging out of the top of the plate to fully engage the coupling. Set this height by tightening the
lock collar on the ACME and trap the shim and bearing into the recess on the plate. Attach the motor as
in the previous step. On the lower portion, perform the same task. Slide a lock collar, bearing, and shim,
then the plate over the bottom of the ACME. Lock the axis in place by tightening the set screw on the
lower lock collar.
Watch the play in the Z final assembly. You should not be able to wiggle the spindle up and down.
Sometimes it is easier to leave a slight gap between the C-Beam and the end plate, then slide the lock
collar all the way down, lock in place, then tighten the 4 qty. M5x25mm bolts. Do not overly compress
the ACME. A very small gap of about .01mm is all that is needed when tightening the axis to remove
play.
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