Adjusting Gibs; Adjusting Leadscrew Backlash - Grizzly G0836 Owner's Manual

Adjusting Gibs

The gibs affect the accuracy of the work table by
restricting slide movements along their ways.
Screws on each end allow gib adjustments to
increase or decrease the friction between the slid-
ing 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.
DISCONNECT MACHINE
BEFORE ADJUSTING THE GIBS!
Make sure all table locks are loose. Then, loosen
one gib adjustment screw (see Figure 68) and
tighten the opposing screw the same amount to
move the gib, while at the same time using the
handwheels to move the table until you feel a
slight drag in that path of movement.
Y-Axis Gib X-Axis Gib
(Front) (Right)
Z-Axis Gib
(Top)
Z-Axis Gib
(Bottom)
Figure 68. Gib adjustment screws.
-42-
FROM POWER
X-Axis
Gib (Left)
Y-Axis Gib (Rear)
Adjusting Leadscrew
Backlash
Tool Needed
Hex Wrench 4mm (long) .................................... 1
Leadscrew backlash is the amount of free-play
movement in the leadscrew (when changing the
direction of rotation) before the attached device
begins to move.
Leadscrews must have a certain amount of back-
lash, but over time, this will increase with normal
wear. Generally, 0.003"–0.006" leadscrew back-
lash is acceptable to ensure smooth movement
and reduce the risk of premature thread wear.
The X- and Y-axis leadscrew backlash is adjusted
by using a long hex wrench to tighten/loosen the
cap screw on the leadscrew nut. This adjusts the
force that the split leadscrew nut exerts on the
leadscrew threads.
The X-axis leadscrew nut shown in Figure 69
is accessed from underneath the left side of the
table.
The Y-axis leadscrew nut is similar and is accessed
from underneath the machine base.
X-Axis
Leadscrew
Backlash
Cap Screws
Figure 69. Handwheel backlash adjustment.
Model G0836 (Mfd. Since 09/17)
Qty
Leadscrew
Nut