Adjusting Gib - Grizzly G0791 Owner's Manual

3. Use punch pin to loosen faceplate and adjust
it until backlash is approximately 0.002"–
0.004", as indicated on graduated dial.
4. Secure setting with set screws.
5.
Repeat adjustments above if necessary.

Adjusting Gib

The goal of adjusting the gib screws is to remove
sloppiness or "play" from the ways without over-
adjusting them to the point where they become
stiff and difficult to move.
In general, loose gibs cause poor finishes and
tool chatter; however, over-tightened gibs cause
premature wear and make it difficult to turn the
handwheels.
The cross-slide and compound slide on this lathe
each use a long steel wedge called a gib that is
positioned between the component and its dove-
tailed-ways. At the end of each gib is a gib screw,
which moves and holds the gib. Depending upon
which direction the gib moves, the space between
the sliding ways increases or decreases to control
the rigidity of the cross slide and compound slide.
Before adjusting the gibs, loosen the locks for
the device so that the gibs can freely slide during
adjustment, then lubricate the ways.
The gib adjustment process usually requires
some trial-and-error. Repeat the adjustment pro-
cess as necessary until you find the best balance
between loose and stiff movement. Most machin-
ists find that the ideal gib adjustment is one where
a small amount of drag or resistance is present,
yet the handwheels are still easy to move.
Model G0791 (Mfd. Since 9/15)
Tools Needed
Standard Screwdriver #2 ................................... 1
Hex Wrench 3mm .............................................. 1
Hex Wrench 6mm .............................................. 1
Wrench 10mm ................................................... 1
Make sure the bedways and leadscrew have
been cleaned and relubricated before beginning
any adjustments. Refer to Lubrication begin-
ning on Page 77 for instructions and lubricant
specifications.
Cross Slide Gib
1. DISCONNECT MACHINE FROM POWER!
2. Loosen locking set screw shown in Figure
144.
Gib Screw
(1 of 2)
Figure 144. Cross slide gib components.
3.
Adjust gib screws as follows:
— To increase slide tension, loosen rear gib
screw ⁄ turn, and tighten front gib screw
1
8
⁄ turn.
1
8
—To decrease slide tension, loosen front gib
screw ⁄ turn, and tighten rear gib screw
1
8
⁄ turn.
1
8
4.
After each adjustment, use cross slide
handwheel to test cross slide movement.
5. Repeat Steps 3–4 until cross slide move-
ment is acceptable.
Qty
Set
Screw
-87-