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Model G0747/G0748 (Mfg. Since 8/12)
-51-
Adjusting Gibs
Gibs are tapered lengths of metal that are sand-
wiched between two moving surfaces. Gibs con-
trol the gap between these surfaces and how they
slide past one another. Correctly adjusting the
gibs is critical to producing good milling results.
Tight gibs make table movement more accurate
but stiff. Loose gibs make moving the table sloppy
but easier to do. The goal of gib adjustment is to
remove unnecessary sloppiness without causing
the ways to bind.
Gibs are adjusted with a screw on each end of
the gib, that move the tapered gib back-and-forth
to increase or decrease the friction pressure
between the sliding surfaces. The process of
properly adjusting the gibs requires trial-and-error
and patience.
DISCONNECT MILL FROM POWER BEFORE
ADJUSTING THE GIBS!
Make sure all table and knee locks are loose.
Then, loosen one gib adjustment screw and
tighten the other the same amount to move the
gib. Use the ball handles/crank to move the table/
knee until you feel a slight drag in that path of
movement.
Refer to Figures 62–64 to identify the locations of
the table, saddle, and knee gibs, and one of the
two adjustment screws for each.
Note: It will be necessary to remove small parts,
such as way wipers and covers, to access the gib
adjustment screws.
Figure 62. Table gib and adjustment screw
underneath left side of table.
Table Gib &
Adjustment Screw
Figure 63. Saddle gib and adjustment screw.
Saddle Gib &
Adjustment Screw
Figure 64. Knee gib and adjustment screw.
Knee Gib &
Adjustment Screw