Adjusting the PRS Z-Axis Bearings • October 17, 2016
© Copyright 2016 ShopBot Tools, Inc.
page 5
To Loosen-
After loosening the bearing, check the nut on the outer edge of the bearing block. Loosening rotates
the bearings in the same direction as necessary to remove the nut. This can lead to other complica-
tions if not corrected. It may be necessary to remove the Y-motor to access the nuts on the right side
of the Z-axis.
Tightening the Eccentric Nuts
Left Side of Z-Axis
After adjusting the eccentric bearing to the proper tension
as instructed above, hold the position of the bearing con-
stant with the flat bar wrench while using a 13mm socket
wrench to tighten the outer nut.
Right Side of Z-Axis
It will probably be necessary to remove the Y-axis motor
to tighten the nuts on the right side. Use a 3/16” hex key
to remove the Y-axis motor. After adjusting the eccen-
tric bearing to the proper tension as instructed above,
hold the position of the bearing constant with the flat bar
wrench while using a 13mm socket wrench to tighten the
outer nut. Reattach and engage Y-axis motor.
