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Adjusting Leadscrew
Backlash
Leadscrew backlash is the amount of motion or
"play" in leadscrew rotation before the attached
device begins to move. Leadscrews will always
have a certain amount of backlash that will
increase with normal wear.
Generally, 0.005"–0.010" leadscrew backlash is
acceptable to ensure smooth movement and
reduce the risk of premature thread wear. However,
if you find it necessary to adjust leadscrew back-
lash, perform the procedures listed below.
Tools Needed
T-Handle Hex Wrench 5mm .............................. 1
Hex Wrench 3mm .............................................. 2
Hex Wrench 8mm .............................................. 1
Wrench 19mm ................................................... 1
X-Axis Leadscrew Backlash
1.
DISCONNECT MILL FROM POWER!
2.
Loosen two cap screws on X-axis leadscrew
nut accessed from underneath left side of
table (see Figure 78).
3.
Rotate adjustment plate on leadscrew nut
(see Figure 78) in small increments, then
check amount of backlash.
Adjustment Plate
Figure 78. X-axis leadscrew nut cap screws and
adjustment plate (viewed from underneath left
side of table).
4.
When you are satisfied with adjustment, re-
tighten two cap screws.
Model G0796/G0797 (Mfd. Since 1/18)
Cross Leadscrew Backlash
1.
2.
3.
Qty
4.
Cap Screws
(1 of 2)
DISCONNECT MACHINE FROM POWER!
Remove hex nut and ball handle from Y-axis
leadscrew (see Figure 79).
Note: In the next step, take care not to mis-
place the leadscrew key as you remove the
parts.
Unthread and remove knurled retaining ring,
graduated dial ring, and leadscrew key (see
Figure 79).
Figure 79. Ball handle, ring, and key removed
from Y-axis leadscrew.
Remove four cap screws from bearing hous-
ing, then slide it off leadscrew (see Figure 80).
Note: It may be necessary to use a dead
blow hammer or rubber mallet on the housing
to knock it loose.
Bearing
Housing
Figure 80. Y-axis bearing housing.
Y-Axis
Leadscrew
-55-
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