Tolerance Parameters For Workpiece Measurement - Siemens SINUMERIK 840 User Manual

1 Introduction
1.7 Tolerance parameters (R33, R34, R36, R37, R40/R41)
2/3 tolerance of workpiece (R34):
Calculation of an average value is carried out within the range of "Lower limit" and "2/3
tolerance of workpiece" according to the formula as given in Section 1.6.2 (measuring
strategy).
Av is compared with R33:
new
When Av is greater than R33, correction is carried out by Av
new
average value memory is erased.
When Av is less than the value in R33, no correction is carried out. This prevents too
new
abrupt corrections from being made (depending on weighting factor k).
Lower limit (zero offset range R33):
This tolerance band conforms to the amount of maximum random dimensional deviations. It
must be determined for every machine. Within these limits, no tool offset applies. However,
the average value of this measuring point is updated and re-stored with the set/actual
difference measured corrected by an empirical value if necessary.
1.7.1

Tolerance parameters for workpiece measurement

R36=Safe area
R37=Dimensional difference
check
R40/R41=Workpiece tolerance
2
R34= / workpiece tolerance
3
R33= Zero offset
(lower limit)
1–24
R42= Setpoint
©
Siemens AG 1990 All Rights Reserved
and the associated
new
Alarm: "Safe area overrun"
Alarm: "Permissible dimensional
difference overrun"
Correction of current deviation,
Alarm: "Oversize", "Undersize"
Correction of current deviation
Averaging and correction
Averaging is stored
6FC5197- AB70
SINUMERIK 840/850/880 (BN)
07.90