
1.AXIS CONTROL B-63323EN-1/03
- 76 -
1.3.8 Gradient Compensation
Overview
By compensating for those errors in tools such as feed screws that
depend on the position of the machine system in detection units,
machining precision can be improved and mechanical life can be
prolonged. In gradient compensation, the compensation amount is
calculated at the compensation point intervals by setting four
representative points and the compensation amounts at these points, in
contrast to stored pitch error compensation, in which the compensation
amount is set for each compensation point. Using the four
compensation points specified for the parameters and the compensation
amounts at these points, three approximation curves are created.
Compensation is performed at the pitch error compensation point
intervals along these approximation curves. The gradient
compensation amount is superimposed on the stored pitch error
compensation amount.
Explanation
- Setting of gradient compensation and output of the compensation amount
. . .
. . .
0
1
2 3 60 61
126
127
(1)
(2)
(3)
(4)
Pitch error compensation point
. . . . . .
a
b
c
d
ε
Output of gradient compensation amounts
Fig. 1.3.8 (a)
To perform gradient compensation, stored pitch error compensation
must be set for the axis subject to compensation.
(1) Number of the most distant pitch error compensation point on the
- side (parameter No. 5421)
(2) Pitch error compensation point interval (parameter No. 5421)
(3) Number of the pitch error compensation point of the reference
position (parameter No. 5421)
(4) Number of the most distant pitch error compensation point on the
+ side (parameter No. 5422)
Gradient compensation parameters must be set.