23
OPERATION MANUAL
F
ig
. 5.3
F
ig
. 5.2
Gibs are tapered lengths of metal that are
sandwiched between two moving surfaces.
Gibs control the gap between these surfaces
and how they slide past one another. Correctly
adjusting the gibs is critical to producing good
milling results.
Tight gibs make table movement more accura-
te but stiff. Loose gibs make moving the table
sloppy but easier to do. The goal of gib ad-
justment is to remove unnecessary sloppiness
without causing the ways to bind.
Gibs are adjusted with a screw on each end
of the gib, that move the tapered gib back-
and-forth to increase or decrease the friction
pressure between the sliding surfaces. The
process of properly adjusting the gibs requires
trial-and-error and patience.
Refer to Fig. 5.2-5.4 to identify the locations of
the table, saddle, and column gibs, and one of
the two adjustment screws for each.
NOTE:
It will be necessary to remove small
parts, such as way wipers and covers, to access
the gib adjustment screws.
The following is the method used to adjust the
gibs.
1. DISCONNECT MACHINE FROM POWER!
2. Make sure all table/column locks are loose.
3. Loosen one gib adjustment screw, then ``
tighten the other the same amount to move
the gib.
4. Use the handles/crank to move table/head
until you feel a slight drag in the path of
movement. Repeat Steps 3–4 as necessary.
5.3 GIB ADJUSTMENT
Saddle Gib
Table Gib
Head Gib
F
ig
. 5.4
07/11/2019
Instructions Manual for HM-46B (M138D)
23
Summary of Contents for HM-46B
Page 26: ...26 OPERATION MANUAL HEAD PARTS DIAGRAM 07 11 2019 Instructions Manual for HM 46B M138D 26 ...
Page 29: ...29 OPERATION MANUAL COLUMN AND TABLE PARTS 07 11 2019 Instructions Manual for HM 46B M138D 29 ...
Page 31: ...31 OPERATION MANUAL WIRING DIAGRAM 07 11 2019 Instructions Manual for HM 46B M138D 31 ...