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XYZ Machine Tools
ProTURN SLX 1630 ProtoTRAK SLX CNC Safety, Installation, Service & Parts List Manual
4.2 The Mechanical Drive Train (X,Z)
Indications:
Troubleshooting instructions indicate that the drive train is potentially the
problem and other, more easily checked, variables have been exhausted.
Roughness, looseness, tightness or jamming movement in the carriage or cross slide.
Carriage walk-up due to Z ball screw misalignment.
1.
Check for machine considerations, especially X gib adjustments and leveling. See
Gib Adjustments, Section 5.2.1.
2.
Do the following special service codes:
Code 12
- this is a procedure that helps the control adjust to the friction
characteristics unique to the machine. Write down the resulting values from
the display. If your problem is control related, check to see if this procedure
has resolved the problem.
3.
The torque required to manually turn the X and Z-axis ballscrews should be
between 10-15 in-lbs. These values should be consistent in both directions and
along all areas of the axis travel. Values that differ from that of above may
correspond to misaligned ball screws.
The following steps take you in a logical sequence through the assemblies. If the
step doesn’t isolate or resolve the problem, it will be necessary to disassemble
the indicated item and move to the next step.
1.
Ensure that the screws that hold the bearing housing in place are not loose.
2.
Ensure that the Clamp Nut is secured. The following applies to the clamp nut:
When loosening, make sure to back out the 10-32 screw from the clamp nut.
3.
When tightening, snug the 10-32 screw to keep the clamp nut from spreading,
after applying the appropriate torque (50 ft lbs), tighten the 10-32 screw.
4.
Take out the angular contact bearings in the X & Z-axis and inspect them. They
should roll smoothly and be lightly greased. If not, replace them. The Z-axis has
2 bearing housings. The tailstock bearing housing only contains 1 ball bearing.
NOTE: The bearing housing and spacer rings are matched sets - keep them together.
5.
With the motor and drives removed, inspect the ball screw, ball nut and yoke for
the potential problems shown in the chart below.
CAUTION
!
Unlike a leadscrew, do not unscrew the ball screw from its nut. This will destroy the ball screw!
