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Adjusting Backlash
Lead screw backlash is the range of motion the
lead screw rotates before the table begins to move.
Lead screws always have a certain amount of
backlash, but it will increase with wear. Generally,
0.005–0.010" of backlash is acceptable.
To adjust the X-axis lead screw backlash:
1.
DISCONNECT THE MILL FROM POWER!
2.
Locate the lead screw backlash adjusting
screws underneath the left side of the table,
as shown in Figure 71.
Figure 71. X-axis lead screw backlash adjusting
screws.
Note: The bottom screw adjusts the amount
of backlash, and the top screw, when tight-
ened down, locks the bottom screw setting.
3.
Loosen the top screw, and tighten the bottom
screw until slightly snug.
4.
Re-tighten the top screw to lock the bottom
screw setting.
5.
Check the amount of backlash by rotating
the X-axis ball handle. Repeat Steps 3–4 if
necessary.
-50-
To adjust the Y-axis lead screw backlash:
1.
DISCONNECT THE MILL FROM POWER!
2.
Using the Y-axis ball handle, move the table
close to the column.
3.
Remove the Y-axis ball handle acorn nut with
a 19mm wrench, then remove the handle
and graduated scale assembly from the lead
screw (see Figure 72).
Note: Align the device keyways with the lead
screw key as you slide them off.
Figure 72. Ball handle and graduated dial
removed from Y-axis lead screw.
4.
Use an 8mm hex wrench to remove the four
cap screws securing the mounting plate
assembly; then remove it from the lead screw
(see Figure 73).
Mounting Plate
Assembly
Figure 73. Removing mounting plate assembly
from lead screw.
Model G9901/G9902/G9903 Milling Machine
Spacers
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