Grizzly Vertical Milling Machines G0728 - Manual (Page 38)

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Models G0728–31 (Mfg. Since 11/11)
Adjusting Gibs
gibs control the accuracy of table movement
along the ways. tight gibs make the movement
more accurate, but harder to move. loose gibs
make the movement sloppy, but easier to move.
the goal of gib adjustment is to remove unneces-
sary sloppiness without causing the ways to bind.
NOTICE
Excessively loose gibs may cause poor
workpiece finishes, and may cause undue
wear of sliding surfaces and ways. Over-
tightening the gibs may cause premature
wear of these sliding devices.
Each sliding surface for the table, saddle, and
knee has a tapered gib that is sandwiched
between the stationary and moving surfaces.
the saddle and knee have a gib on both sides.
there are two adjustment screws, one on each
end of each gib, that move the tapered gib back
and forth, increasing or decreasing friction of the
sliding surfaces.
DisConnECt thE Mill FroM poWEr
BEForE aDJusting thE giBs!
to adjust the gibs, loosen one adjustment screw
and tighten the other the same amount to move
the gib until you feel a slight drag in that path of
movement.
refer to figures 48–50 for the locations of the
table, saddle, and knee gib adjustment screws.
figure 49. saddle gib adjustment screw (1 of 2).
saddle gib adjustment
screw (1 of 2)
figure 50. Knee gib adjustment screw (1 of 2).
Knee gib adjustment screw
(1 of 2)
figure 48. table gib adjustment screw (1 of 2).
table gib adjustment
screw (1 of 2)