Specifications

Southwestern Industries, Inc.
ProtoTRAK

SMX K2, K3, K4 & Retrofit Safety, Installation, Maintenance, Service & Parts List Manual
51
Possible Cause Check This
X and Y-axis Drive Trains are loose
Check Repeatability using the Repeatability and
Positional Accuracy procedure. Step by step, carefully
inspect the Drive Train for any looseness. It may be
necessary to disassemble and then reassemble the
Drive Train. See Mechanical Drive Train (X, Y) Section
4.2
Encoder Disk or Reader Head on motor
are loose
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 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 0.0003"
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.
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 SWI 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
Motor Encoder not counting See Motor diagnostics (not applicable with Glass Scale
option). Single feedback only.
Glass Scale or Sensor Failure Does axis now count? If so, replace scale or sensor.
Computer/Pendant failure
See Computer/Pendant diagnostics