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adjusting gibs
Adjusting Gibs
Gibs control the accuracy of table movements
along the ways. Tight gibs make the movements
more accurate, but harder to move. Loose gibs
make the movements sloppy, but easier to move.
The goal of gib adjustment is to remove unnec-
essary sloppiness without causing the ways to
bind.
NOTICE
Excessively loose gibs may cause poor
finishes on the workpiece, and may cause
undue wear of sliding surfaces and ways.
Over-tightening the gibs may cause prema-
ture wear of these sliding devices.
Each sliding surface on your mill table has a
tapered gib that is sandwiched between the sta-
tionary and moving surfaces. There is one adjust-
ing screw for each that moves the tapered gib
back and forth.
Note: To access the cross and elevation gib
adjusting screws, you must remove the covering
way wipers.
The ram gib does not need adjustment. The hori-
zontal locking bolts apply force when tight, and
allow the gib to slide along the dovetail way when
loose.
DISCONNECT THE MILL FROM POWER
BEFORE ADJUSTING THE GIBS!
Adjust the gibs by turning the gib adjusting screw
until you feel a slight drag when moving the sliding
component.
Refer to Figures 68–70 for the locations of the gib
adjusting screws.
Model G9901/G9902/G9903 Milling Machine
Figure 68. X-axis gib adjusting screw
(underneath the left side of the table).
Figure 69. Y-axis gib adjusting screw (right front
side of table).
Figure 70. Z-axis gib adjusting screw (left side of
knee).
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