Gib Adjustment - Grizzly G0720R Owner's Manual

Gib Adjustment

The headstock and table on this mill each use a
long steel wedge called a gib that is positioned
between the component and its dovetailed-ways.
At the end of each gib is a screw, as shown in
Figure 45.
Lock Lever
Front Gib
Screw (Y-axis)
Figure 45. Table gib screws and lock levers.
The screws at each end of the gib oppose one
another to move and hold the gib in a forward or
aft position. Depending which direction the gib is
moved and held, the space between the sliding
ways is increased or decreased to control the
rigidity of the headstock and table.
The leadscrew and leadscrew nuts on this machine
are non-adjustable and are only replaced as a
matched set. Clean and relubricate the ways,
slides, and leadscrews before attempting to adjust
the gibs.
Model G0720R (Mfg. Since 11/10)
Right Gib
Screw (X-axis)
NOTICE
When adjusting gibs, keep in mind that the
goal of gib adjustment is to remove unnec-
essary sloppiness from the slide without
causing binding and excessive leadscrew
nut wear.
Table Gib Adjustment
1.
DISCONNECT MILL FROM POWER!
2. Loosen the table lock levers (see Figure 45)
so the table is free to slide.
3.
For the X-axis gib, adjust as follows:
—To increase slide tension, loosen the left
gib screw ⁄ -turn, and tighten the right gib
1
8
screw ⁄ -turn.
1
8
—To decrease slide tension, loosen the right
gib screw ⁄ -turn, and tighten the left gib
1
8
screw ⁄ -turn.
1
8
4.
For the Y-axis gib, remove the rear way cover
and adjust as follows:
—To increase slide tension, loosen the rear
gib screw ⁄ -turn, and tighten the front gib
1
8
screw 1 ⁄ -turn.
8
—To decrease slide tension, loosen the front
gib screw ⁄ -turn, and tighten the rear gib
1
8
screw ⁄ -turn.
1
8
5. Repeat adjustments as necessary until the
gib screw drag is acceptable, and re-install
the way cover.
6. When properly adjusted, there should be
slight resistance felt in the handwheels when
the table is moved.
-35-