Adjusting Gib - Grizzly G0776 Owner's Manual

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. 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.
Before adjusting the gibs, loosen the locks for the
devices so the gibs can slide freely during adjust-
ment, 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.
-78-
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 68 for instructions and lubricant specifica-
tions.
Tool Needed
Standard Screwdriver #2 ................................... 1
To adjust cross slide gib:
1.
DISCONNECT LATHE FROM POWER!
2. Loosen gib screws (see Figure 131) and
adjust as required.
Front
Gib Screw
Front End of Gib
Figure 131. 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
3. Repeat adjustments as necessary until gib
screw drag is acceptable.
Model G0776 (Mfd. Since 7/14)
Qty
Rear Gib
Screw