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XYZ Machine Tools Ltd
XYZ Bed Mill Safety, Installation, Maintenance, Service & Parts List Manual
Spindle and/or Quill are loose
Use a Dial Indicator and check for side-to-side movement between
the Spindle and the Head. Next, check for side-to-side movement
between the Quill and the Head. There should be no more than
0.01 mm of side-to-side movement. Make sure that there is a few
thousandths gap between the Spindle Collar and the Quill after
tightening.
Head bolts are loose
Tighten Ram bolts
3.4.2
X, Y, and Z-Axis Measurements are not Accurate
Measurements repeat, but with a dial indicator mounted to the bottom the spindle, traversing the length
of a gage block or some other measurement standard, the measurement is not accurate.
Note: If your part has incorrect dimensions, see Parts Have Incorrect Dimensions, Section 3.1.4.
Note: First check for repeatability of the DRO: With a dial indicator mounted to the bottom of the spindle,
touch off a fixed surface either in the X, Y, or Z-axis direction and set the DRO equal to 0. Crank away
several centimetres and touch off again at the same place. If the reading has not returned to 0 on the
DRO, zero the display and repeat the procedure. If the measurement does not repeat, you have a
repeatability problem that must be resolved before the accuracy problem can be resolved. See
Measurements That Do Not Repeat, Section 3.4.1.
Possible Cause
Do This
The Calibration is incorrect
Recalibrate the machine.
See Calibration & Backlash
Constants
Incorrect backlash values
If the machine does not repeat bi-directionally check the backlash
on the axis in question.
See Section 5.2.2.
3.4.3
The DRO is not Counting
The DRO for one axis is not counting when an axis is moved. Often times if this is the case the axis will
fault. See section on faulting.
Do the following Service Codes:
Code 33 Software Identification. This is needed if you call Customer Service.
Code 100 Axis open loop test. Used to check the maximum feedrate of an axis and if the
encoders are counting.
Code 304 & 305 Turns off X and Y sensor or scale.
Possible Cause
Check This
Servo driver failure
See Servo driver Section 4.5
Motor Encoder not counting
See Motor diagnostics (not applicable with Glass Scale option)
Glass Scale or Sensor Failure
Does axis now count? If so, replace scale.
Computer/Pendant failure
See Computer/Pendant diagnostics
3.4.4
X, Y, and Z-Axis DRO Counting in Wrong Direction
The DRO is counting in the wrong direction or axes jog in the wrong direction.
The positive directions for each axis should be:
X-axis – Table moves to the left
Y-axis – Saddle moves toward the front of the machine
Z-axis – Head moves up
Do the following service code and procedures:
Code 33 Software Identification. This is needed if you call Customer Service.
