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XYZ Machine Tools Ltd
XYZ Bed Mill Safety, Installation, Maintenance, Service & Parts List Manual
5.1.8
Ball Screw Replacement, X-Axis (Table) – 4000, 5000
1.
Remove table way covers from each side of the table.
2.
Remove the left bearing housing cover by removing the (8) 10-24 truss head screws that secure it
to the left-bearing bracket.
3.
Remove the motor cover/housing by removing the (4) 10-24 truss head screw secures it to the
left bearing housing.
4.
Remove the X-axis motor and belt from the left side of the table.
5.
Using a #8 Allen hex key at the end of the ball screw to hold it, remove the hex nut and lock
washer securing the ball screw pulley.
6.
Remove pulley, key, and locking sleeve on the ball screw.
7.
Remove the (4) 3/8”-16 SHCS securing the left bearing housing to the saddle.
8.
Remove left bearing housing and ball screw bushing.
9.
Remove the (3) ¼-20 SHCS securing the right bearing housing cover.
10.
Remove the housing cover.
11.
Disengage the lock washer tab from the two lock nut.
12.
Loosen and remove the (2) lock nut.
13.
Remove the (4) 3/8-16 SHCS securing the right bearing housing
14.
Remove the right bearing housing and bushing.
15.
Slide the table to the right; remove the oil line and the (3) 5/16-18 SHCS that secure the ball nut
to the yoke.
16.
Pull the ball screw out.
To reassemble
17.
Install the new ball screw into the yoke.
18.
Reconnect oil line and fasten ball nut into yoke.
19.
Slide table back to the centre and assemble the left side of the X-axis.
20.
Slide the left bearing housing bushing onto the ball screw.
21.
Slide left bearing housing with bearing onto ball screw.
22.
Mount bearing housing to saddle with the (4) 3/8-16 SHCS.
23.
Slide locking sleeve onto ball screw with the short side out.
24.
Install key and slide pulley onto ball screw.
25.
Secure pulley with the lock washer and hex nut. (Note: Use a #8 Allen hex key to hold ball
screw.)
26.
Install motor, mounting bracket, motor spacer bracket, woodruff key, ferrule, pulley, star washer
and nut. Before tightening down the motor mounting bracket move the table all the way to the
left.
27.
Move table to the right and assemble right side bearing housing.
28.
Assemble motor to bracket. The servo should be facing toward the rear of the machine.
29.
Install belt. Tighten lower 2 bolts followed by the top 2 bolts to properly tension belt.
30.
Attach the sheet metal to the motor mounting bracket.
31.
Install the table trays.
See the diagnostics section under Mechanical Drive Train for an explanation of how to align the ball
screw.
See Figures 21 through 23 for an illustration of the X-axis drive train.
