1 Introduction 07.90
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
new
is compared with R33:
When Av
new
is greater than R33, correction is carried out by Av
new
and the associated
average value memory is erased.
When Av
new
is less than the value in R33, no correction is carried out. This prevents too
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
R34=
2
/
3
workpiece tolerance
R36=Safe area
R37=Dimensional difference
check
Alarm: ”Permissible dimensional
difference overrun”
Alarm: ”Safe area overrun”
R42= Setpoint
Correction of current deviation,
Alarm: ”Oversize”, ”Undersize”
Correction of current deviation
Averaging and correction
R40/R41=Workpiece tolerance
R33= Zero offset
(lower limit)
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Averaging is stored
1–24 © Siemens AG 1990 All Rights Reserved 6FC5197- AB70
SINUMERIK 840/850/880 (BN)
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