Adjusting Gibs - Grizzly G8689Z Owner's Manual

Adjusting Gibs

The gibs affect the accuracy of the work table by
restricting slide movements along their ways.
Three screws and jam nuts on each gib allow gib
adjustments to increase or decrease the friction
between the sliding surfaces of the ways.
The goal of gib adjustment is to remove unneces-
sary sloppiness without causing binding in the
dovetail ways. Tight gibs make the movements
more accurate, but harder to perform. Loose
gibs make the movements sloppy, but easier
to perform. Many experienced machinists adjust
the gibs until there is just a slight drag in table
movement.
Tools Needed
Open-End Wrench 10mm .................................. 1
Hex Wrench 3mm .............................................. 1
To adjust gibs:
1.
DISCONNECT MACHINE FROM POWER!
2.
Use hex wrench to prevent set screws from
moving while loosening jam nuts on gib you
wish to adjust (see Figures 52–54).
3.
Slightly adjust gib set screws an equal
amount.
— For X-axis gib, adjust (4) screws shown in
Figure 52 and use X-axis handwheel to
test gib adjustment.
x 4
Figure 52. Example of adjusting X-axis gib.
Model G8689Z (Mfd. Since 07/23)
— For Y-axis gib, adjust (2) screws shown in
Figure 53 and use Y-axis handwheel to
test gib adjustment.
x 2
Figure 53. Location of Y-axis gib screws and
Qty
— For Z-axis gib, adjust (4) screws shown in
Figure 54 and use rapid downfeed levers
to test gib adjustments.
Figure 54. Location of Z-axis gib screws and
4.
When you are satisfied with gib adjustment,
tighten jam screws without moving gib set
screws.
jam nuts.
x 4
jam nuts.
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