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XYZ Machine Tools Ltd
XYZ Bed Mill Safety, Installation, Maintenance, Service & Parts List Manual
5.2.1.7
Head Side Gib Adjustment - Z Axis
1.
Clean all swarf, dirt and excess oil from the column ways.
2.
Attach a dial indicator with a magnetic base towards the rear of the table on the right side of
the ram. Place the indicator stylus on the ram in line and below the lower mounting bolt for
the coolant hose connector block. (See Figure 42).
3.
Lock and unlock the lower ram side gib lock and note the amount of movement on the dial
indicator. Adjust the ram side gib until the registered movement is 0.012-0.02mm.
To adjust the gib for excessive clearance: Loosen the gib lock screw on the bottom
of the ram. Estimate the amount of gib lock screw adjustment required, and tighten the
gib lock screw on the top of the ram. Tighten the gib lock screw on the bottom of the
ram to lock the gib in place, and recheck. Repeat as necessary.
To adjust the gib for too small of a clearance: Loosen the gib lock screw on the top
of the ram. Estimate the amount of gib lock screw adjustment required and tighten the
gib lock screw on the bottom of the ram. Tighten the gib lock screw on the top of the
ram to lock the gib in place, and recheck. Repeat as necessary.
4.
Run Service Code 12 to set the feed forward constant.
5.
Reattach the upper and lower way cover to the ram.
CAUTION!
Be careful not to over tighten the Head gibs. Over tightening may lead to faulting and
repeatability problems. Double-check the gib adjustment by checking the torque on the Z-
axis. Use an in-lb torque wrench on top of the ball screw and typical readings should be from
12 to 17 in-lbs and consistent across the Z travel.
Figure 42 - Head Side Gib Adjustment
5.2.2
Calibration & Backlash Constants
Calibration and backlash constants were set as part of the installation and set-up of your system. They
should be re-set when indicated in the Troubleshooting section or after the replacement of the Computer
module, or any parts of the drive train.
5.2.2.1
X, Y, Z and Quill Calibration
Calibration is used teach the machine a known distance. We typically calibrate our machines over a
150 mm distance. There is no limit to the distance over which the machine can be calibrated.
