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9.
Rotate spindle so indicator point rests on par-
allel block, as illustrated in Figure 97, then
zero dial.
10. Rotate spindle so that indicator point rests on
other end of block in same manner, then read
dial.
— If indicator dial still reads zero or is within
the acceptable variance, the spindle is
precisely perpendicular to table in both
X- and Y-axes, and tramming procedure
is complete.
— If indicator dial has moved from zero
beyond acceptable variance, you will need
to compensate for that amount by tilting
head forward or backward. Repeat Steps
9–10 until you are satisfied with spindle
axis alignment along table Y-axis.
Note: Keep one of the tilt lock bolts just snug
so the head does not move loosely while you
adjust it. Remember to tighten all the tilt lock
bolts after adjusting the head.
-60-
Adjusting Leadscrew
Backlash
Leadscrew backlash is the amount of free play
movement in the leadscrew (when the leadscrew
moves but the table does not) after changing the
direction of rotation.
A leadscrew must have a certain amount of back-
lash to rotate easily, but over time, it increases
with wear. Generally, 0.005"–0.010" leadscrew
backlash is acceptable to ensure smooth move-
ment and reduce premature thread wear.
Tool Needed
Flat Head Screwdriver ....................................... 1
Adjustable Spanner Wrench .............................. 1
Adjusting
X-Axis
Backlash
1.
DISCONNECT MACHINE FROM POWER!
2.
Locate X-axis leadscrew backlash adjusting
screws underneath right side of table (see
Figure 98).
Figure 98. X-axis leadscrew backlash adjusting
screws.
Note: The bottom screw adjusts the amount
of backlash, and the top screw, when tight-
ened, locks the bottom screw setting.
3.
Loosen top screw, and tighten bottom screw
until slightly snug.
4.
Re-tighten top screw to lock bottom screw
setting.
5.
Check amount of backlash by rotating X-axis
handwheel.
Model G0827 (Mfd. Since 11/17)
Qty
Leadscrew
Top Adjusting Screw
Bottom Adjusting Screw
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