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6. Machine Accuracy Measurement and Adjustment
[1] Straightness
6.1 X Axis Movement Straightness
- Z plane
① Measurement
Place two blocks whose height is equal in the X-axis direction on the table and place
a straight edge over it in the upright position, and then set up an indicator on the
spindle head and set it to
“0” at both ends of the
upper side of the straight edge, and
measure the maximum difference (i.e. the measurement in the middle) while moving
the X-axis.
▪ If the measurement value is not “0” when measuring one end with the other
to “0,” take half the amount of error as the measurement value.
※ If a Straight Edge has not been prepared, measure both ends and the center on
the Y-axis plane of a square ruler instead, when measuring the Y-Z squareness.
▶ Measurement position : Both ends and the center of the straight edge.
▶ Tolerance : 0.005mm / 300mm
② Adjustment
If the straightness of the X-Z plane of the X-axis is wrong, an irregularity of the
machine feed level could be a possible cause, in which case re-leveling should be
performed by referring to “Machine Level Operation.”
▪ If the problem is not resolved by re-leveling as mentioned above, an X-axis LM
Guide defect or an LM Guide misalignment could be another possible cause, in
which case it will be necessary to replace the LM Guide or re-align it to resolve the
problem.
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