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XYZ Machine Tools Ltd
XYZ Bed Mill Safety, Installation, Maintenance, Service & Parts List Manual
6.
Remove the (2) 5/16 x 1" screws holding the ball nut to the yoke and loosen the 4 screws that
mount the yoke to the saddle. Remove the oil line.
7.
Tilt the yoke (it is pinned) to remove the ball screw.
8.
Remove the elbow and setscrew from the old ball screw flange and fit them similarly in the new
ball screw.
9.
Pump oil to be certain it flows through the oil line and then attach the oil line to the elbow.
10.
Reassemble all assemblies.
Important: The clamp nut must be reassembled as follows:
Install rear bearing and seal into bearing housing and slide housing onto the ball screw.
(Note:
Letters on bearings must face each other in the housing.)
Thread the split nut onto the ball screw and tighten the #10-32 clamp screw until you feel the
split nut contact the ball screw threads. It should drag as you tighten the clamp nut.
Torque the split nut to 50 ft. lb.
Firmly tighten the #10-32 clamp screw to lock the clamp nut in place.
See the diagnostics section under Mechanical Drive Train for an explanation of how to align the ball
screw.
See Figures 17 and 18 for an illustration of the X-axis drive train.
