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XYZ Machine Tools Ltd
TRAK
2
OP
Installation, Maintenance, Service & Part List Manual
Faulty motor encoder
Swap the motor in question with a known good motor. For example,
swap the X-axis motor with the Y-axis motor. If the symptom stays
with the motor in question, then replace the motor. If not, then the
motor is not at fault and something else is causing the problem.
Spindle may be loose
Use a Dial Indicator and check for side-to-side movement between
the Spindle and the Head. There should be no more than 0.008mm
of side-to-side movement.
4.6.2
X, Y, and Z-Axis Measurements are not Accurate
Measurements repeat, but with a dial indicator mounted to the bottom of the spindle, traversing the length
of a gauge block or some other measurement standard, the measurement is not accurate. Check for
accuracy in 1 direction initially so as to not bring backlash into play. If you reverse direction and have not
set the backlash correctly, this could be the cause of your error.
Note:
•
If your part has incorrect dimensions, see Parts Have Incorrect Dimensions, Section 4.1.3.
•
First check for repeatability of the DRO as per section 4.6.1. Any repeatability problems must be
resolved before accuracy problems can be resolved.
Possible Cause
Do This
Machine Tool & Setup problem
Check for any looseness in the setup (Tool, Tool holder, Part, Vise,
or Fixture). Make sure there is sufficient contact between the tool
holder and the spindle. See Machine Tool & Setup Section 5.1
Part has been programmed wrong Check the programming of your part to make sure no errors were
made.
The tool diameter or tool length
has not been entered correctly
Make sure you have measured the OD of the cutter and entered it
correctly. Also check the tool length entered for your tool.
Thermal expansion of the
ballscrew
If the machine is run very hard at high feedrates then this may
come into play.
Calibration has not been
performed or is wrong
Go to service code 123 and recalibrate the machine
Incorrect backlash values
If the machine does not repeat bi-directionally check the backlash
on the axis in question. See Section 7.2.
4.6.3
The DRO is not counting
The DRO for one axis is not counting when an axis is moved. This will usually cause an axis to fault out.
See Faulting Axis Section 4.3.4
Do the following Service Codes:
•
Code 33 (Software Identification):
This is needed if you call XYZ Customer Service.
•
Code 131 (Manual DRO):
Press the E-stop before going to this service code. Turn
the X or Y axis ballscrew manually to make sure the motor encoder counts. Each axis should count
6mm per revolution of motor or ballscrew. Code 131 does not work on the Z axis.
Possible Cause
Check This
The E-stop is pressed
Undo the E-stop and press the Servo on button
Servo amp failure
See Servo amp Section 5.5
Motor Encoder not counting
See Motor diagnostics, section 5.5
Computer module failure
See Computer module diagnostics, section 5.3
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