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Mount a dial indicator to the mill table along the X-axis to the left of the spindle, with the tip pointing at the spindle.
. Jog the Y- and Z-axis to position the spindle head so the indictor tip contacts the outer diameter of the spindle cartridge (see Figure 9.1).
Carefully jog the X-axis in the positive direction until the indictor contacts the spindle. After initial contact, continue to jog the X-axis in the positive direction so that the dial makes at least one complete revolution; stop when dial reads 0.
Zero the X DRO field in PathPilot
In MDI field, program a positive X move of .01” at a feed rate of 5 IPM: G01 X.01 F5. The spindle head moves slightly in +X direction. When finished, indictor should read .010”.
Program an X move back to 0: G01 X0 F5. The spindle head moves slightly in the -X direction. The X DRO should say 0; however, the dial indicator should read a number very close to 0. This value is the measured lost motion.
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Backlash compensation is used after the gib and angular contact bearings have been adjusted to less than .001” of lost motion.
Use the “ADMIN “ADMIN SET_AXIS_BACKLASH” BACKLASH” command in the MDI line to apply backlash compensation. Use X/Y/Z following the command to indicate the axis to apply backlash compensation to and a number following the axis to indicate the amount of compensation to apply. Compensation is limited to .005” per axis.
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The “ADMIN “ADMIN GET_AXIS_BACKLASH” BACKLASH” command will display the current amount of backlash for each axis. The “ADMIN “ADMIN RESET_AXIS_BACKLASH” BACKLASH” command will reset the backlash values of all axes to 0.
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