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6. Machine Accuracy Measurement and Adjustment
6.14 Run-Out of Spindle Cross Section
Disassemble and take out the driving key from the spindle cross section, perform “0 ”
setting while placing the indicator against the spindle, and then take the maximum run-
out value as the measurement value by rotating the spindle at low speed.
※ If the Test Bar is inserted, apply grease to the polished surface of the end cross
section of the Test Bar or its center drilling position. Attach a steel ball and measure
the Run-Out at the highest point of the ball using an indicator.
▶ Measurement position : Spindle cross section or Test Bar end cross section
▶ Tolerance : 0.005 mm
Movement of the spindle in the Z-axis direction is generally presumed to be associated
with a problem with the spindle main bearing, in which case the bearing will have to be
replaced.
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