Adjusting Gibs - Grizzly G0796 Owner's Manual

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.
Refer to Figures 75–77 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.
Tools Needed
Screwdriver Phillips, Flat Head .....................1 Ea
To adjust gibs:
1.
DISCONNECT MACHINE FROM POWER!
2.
Make sure all table/knee locks are loose.
3.
Loosen one gib adjustment screw, then tight-
en the other the same amount to move the
gib.
4.
Use ball handles/crank to move table/knee
until you feel a slight drag in the path of
movement. Repeat Steps 3–4 as necessary.
-54-
Table Gib &
Adjustment Screw
Figure 75. Table gib and adjustment screw
underneath left side of table.
Saddle Gib &
Adjustment Screw
Figure 76. Saddle gib and adjustment screw.
Qty
Knee Gib &
Adjustment Screw
Figure 77. Knee gib and adjustment screw.
Model G0796/G0797 (Mfd. Since 1/18)