Siemens SINUMERIK 840C Installation Instructions Manual page 779

12 Functional Descriptions
12.1.2 Functional description
The spacing between 2 leadscrew error compensation points (MD 324*) is then specified,
being based on the permissible tolerance of the final (compensated) leadscrew error curve, the
actual leadscrew pitch error and the number of possible compensating values.
The following method for determining the spacing between 2 leadscrew error compensation
points may be used:
S : Compensation amount, e.g. 1/2 tolerance band
l : Spacing between 2 leadscrew error compensation points
+F
S
- F
The point with the greatest pitch error is determined and the travel ( l) in which the specified
amount ( S) is passed through is established.
S : Compensation amount
l : Spacing = MD 324*
+
+
S +
l
The relevant compensating values for the spacing is based on the permissible tolerance band,
and should be selected so that the compensated error curve approximates as closely as
possible the ideal condition. The compensating value (0 to 100 units) is transferred to
NC MD 328*.
12–4
Maximum slope of
error curve
S
l
= MD 328*
-
-
-
-
-
© Siemens AG 1992 All Rights Reserved
06.93
Setpoint
position
+
6FC5197- AA50
SINUMERIK 840C (IA)