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Model SB1063
Adjusting Gibs
Gibs are tapered lengths of metal between two
sliding surfaces. Gibs control the gap between
these surfaces and how accurately they slide.
Correctly adjusting the gibs is critical to
producing good milling results.
Tight gibs make table movement more accurate
but stiff. Loose gibs make moving the table less
accurate but easier. The goal of gib adjustment
is to remove unnecessary play without causing
the ways to bind and the ballscrews to wear
prematurely.
Gibs are adjusted with a screw at each end.
The screws are adjusted in unison to move the
gib back and forth to increase or decrease the
gap between the ways. The process of properly
adjusting the gibs is a trial-and-error process
based on how much preload they apply to the
ways.
Refer to Figures 45–47 to identify the locations
of the table, saddle, and knee gibs, and the
adjustment screws for each.
The saddle and knee have three gibs each—two
on each side, and one that is left of center. Adjust
the gibs on the sides first, then adjust the left-
center gib.
To adjust gibs:
1.
DISCONNECT MILL FROM POWER!
2.
Remove small parts, such as way wipers and
covers, to access gib adjustment screws.
3.
Loosen all table and knee locks, and clean
and lightly oil ways.
4.
Center table on saddle.
5.
Loosen one gib adjustment screw and tighten
opposing screw same amount to move gib.
Use handwheel crank to move the table and
6.
knee until you feel a slight drag.
Reinstall small parts, such as way wipers
7.
and covers that were removed to access gib
adjustment screws.
-44-
S E R V I C E
ON
OFF
Figure 45. Typical table gib and adjustment screw
underneath the left side of the table.
Left-Center Gib
Adjustment Screw
Figure 46. Typical saddle gib adjustment screws.
Side Gib
Adjustment Screw
(1 of 2)
Figure 47. Typical knee gib adjustment screws.
For Machines Mfd. Since 5/19
Table Gib &
Adjustment Screw
Side Gib
Adjustment Screw
(1 of 2)
Left of Center Gib
Adjustment Screw
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