Adjusting Gib - Grizzly G0782 Owner's Manual

Adjusting Gib

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. Gib screws at each end move 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.
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.
Before adjusting the gibs, loosen the gib locks so
the gibs can slide freely during adjustment, then
lubricate the ways.
The gib adjustment process usually requires
some trial-and-error. Repeat the process as nec-
essary until you find the best balance between
loose and stiff movement. Most machinists 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 G0782 (Mfd. Since 10/15)
Cross Slide Gib
Make sure the ways and leadscrew have been
cleaned and re-lubricated before beginning any
adjustments. Refer to Ball Oiler Lubrication on
Page 65 for instructions and lubricant specifica-
tions.
Tools Needed
Standard Screwdriver #2 ................................... 1
Hex Wrench 3mm .............................................. 1
To adjust cross slide gib:
1.
DISCONNECT MACHINE FROM POWER!
2.
Remove back splash to access rear gib
screw.
3. Loosen cross slide gib lock (see Figure 124).
4. Loosen gib screws (see Figure 124) and
adjust as required.
Rear Gib Screw (Located
Under Leadscrew Guard)
Front
Gib Screw
Front End of Gib
Figure 124. Cross slide gib components.
—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
5. Repeat adjustments as necessary until gib
screw drag is acceptable.
6. Re-install back splash.
Qty
Cross Slide
Gib Lock
-75-