
9.ACCURACY COMPENSASION FUNCTION NC FUNCTION B-63942EN/02
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9.6 BI-DIRECTIONAL PITCH ERROR COMPENSATION
In bi-directional pitch error compensation, different pitch error
compensation amounts can be set for travel in the positive direction
and that in the negative direction, so that pitch error compensation can
be performed differently in the two directions, in contrast to stored
pitch error compensation, which does not distinguish between the
directions of travel. In addition, when the direction of travel is
reversed, the compensation amount is automatically calculated from
the pitch error compensation data to perform compensation in the
same way as in backlash compensation. This reduces the difference
between the paths in the positive and negative directions.
9.7 EXTENDED BI-DIRECTIONAL PITCH ERROR
COMPENSATION
In bi-directional pitch error compensation, it is possible to use 0 to
1535, 3000 to 4535 points as the compensation points. By using this
function, the compensation points are extended and it is possible to
use 0 to 2559, 3000 to 5559 points as the compensation points.
9.8 PERIODICAL SECONDARY PITCH ERROR
COMPENSATION
When a rotary table is rotated using a gear, there are two cycles of the
occurrence of pitch errors: One cycle is the same as that of the rotation
of the rotary table while the other is the same as that of the rotation of
the gear for rotating the rotary table. To compensate for pitch errors of
these types, the compensation for the pitch error due to the rotation of
the gear is superimposed on the compensation for the pitch error per
rotation of the rotary table.