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XYZ Machine Tools Ltd
XYZ Bed Mill Safety, Installation, Maintenance, Service & Parts List Manual
Do the following Service Codes and document values:
Code 33 Software Identification. This is needed if you call Customer Service
Code 11 Measures backlash in the system (Only used on Dual Feedback systems)
Code 12 Feed Forward Constant
Code 127 Measures backlash in the system (not used on Dual Feedback systems)
Code 128 Enter backlash compensation
Possible Cause
Check This
Torque values on X and Y-axis are
too high.
Make sure torque is lower than 20 in-lbs. Normal values for a
machine that is aligned and adjusted properly should be
between 10 and 15 in-lbs when driving axis. Make sure torque
is consistent across axis travel.
Machine Tool and Setup problem
Check for any looseness in the setup (Tool, Tool holder, Part,
Vice, or Fixture). See Machine Tool & Setup - Section 4.1
Machine not level
Verify that the machine is level to specification.
Head is not Trammed
Verify that the Head is Trammed to specification. See
Tramming the Head
X, Y, and Z-axis Gibs are not adjusted
properly
Check the adjustment of the X, Y, and Z-axis Gibs using the X,
Y, and Z-axis Gib adjustment procedures.
Calibration or Backlash problem
Recalibrate the machine. Reset the Backlash. Check
Repeatability and Positional Accuracy. See Calibration &
Backlash Constants Section 5.2.2
Newall Scale problem
Make sure that the Newall Scale is installed correctly according
to the Newall Scale Installation procedures. Check for any
loose brackets or misalignment etc. Also, check to make sure
the Newall Scale assemblies are functioning correctly. See
Newall Scales Sections 4.6 & 4.7.
X & 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
Head Bolts are loose
Verify that all the head bolts are tight.
3.1.3
Taper Cut on a Programmed Straight Line Move
An unwanted tapered cut occurs, when the machine is programmed to move in a straight line along either
the X or Y-axis. The DRO shows motion of a few thousandths of an inch in the axis that is not supposed
to be moving.
Explanation: For straight line cuts along the X or Y-axis, the control is designed to lock the motor of the
axis that is not moving. A taper is created when there is play in the system. The force of the tool shoves
the table or saddle out of position.
The system will respond to being pushed out of position by making an adjustment at the end of the
move.
An unwanted tapered cut is the result of looseness in the system.
Do the following Service Codes and document values:
Code 33 Software Identification. This is needed if you call Customer Service
Code 11 Measure's the backlash in the system. Only used on machines with Dual Feedback
systems
Code 12 Feed Forward Constant
Code 127 Measure's the backlash in the system. Only used on machines with no Dual Feedback
Code 128 Enter backlash compensation
