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Background
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The following method describes the proper procedure to measure Z-axis backlash. An analogous procedure is used to measure X-axis lost backlash.
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Mount a dial indicator to the machine bed along the Z-axis with the tip in line with the x axis carriage. Be sure that the indicator needle will touch a machined surface.
. Jog the X- and Z-axis to position the carriage so the indictor tip contacts the edge of the carriage.
Carefully jog the Z-axis in the negative direction until the indictor contacts the spindle. After initial contact, continue to jog the Z-axis in the negative 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 negative Z move of .01” at a feed rate of 5 IPM: G01 X.01 F5. The carriage moves slightly in -Z direction. When finished, indictor should read .010”.
Program a Z move back to 0: G01 X0 F5. The carriage moves slightly in the +Z direction. The Z 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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