5.2 Maintenance
5.2.1 Gib Adjustments
The objective of adjusting the gibs is to eliminate as much play in the table, saddle and ram sliding
surfaces as possible without having the tightness of the gib interfere with their free movement and cause
a decrease in the accuracy and/or performance of the machine due to excessive friction.
5.2.1.1
Table Gib Adjustment, X-Axis – 2500 & 3500
See Figure 36.
1. Clean all swarf, dirt and excess oil from the table and saddle.
2. Centre the saddle on the bed ways.
3. Move the table fully to the left side of the saddle.
Note: For machines that have excessive wear in the centre of the table way, it will be necessary
to centre the table on the saddle. The resulting adjustment of the gib will be compromised to
account for the varying clearance from the centre to the ends of the table.
4. Attach a dial indicator with a magnetic base to the left front of the saddle. Place the indicator
stylus on the front surface of the table as close to the indicator base as possible.
5. Move the left end of the table back and forth and note the amount of movement on the dial
indicator. Adjust the X-axis gib until the registered movement is 0.02-0.04mm.
To adjust the gib for excessive clearance: Loosen the gib lock screw on the right
end of the saddle. Estimate the amount of gib lock screw adjustment required, and
tighten the gib lock screw on the left end of the saddle. Tighten the gib lock screw on the
right end of the saddle to lock the give in place, and recheck. Repeat as necessary.
To adjust the gib for too small of a clearance: Loosen the gib lock screw on the left
end of the saddle. Estimate the amount of gib lock screw adjustment required, and
tighten the gib lock screw on the right end of the saddle. Tighten the gib lock screw on
the left end of the saddle to lock the gib in place, and recheck. Repeat as necessary.
Figure 36 – SMX 2500 & 3500 - Table Gib Adjustment
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