L974 Multi-Point Measurement On Circumference - Siemens SINUMERIK 840 User Manual

4 Measuring Cycles for Turning Machines

4.3.5 L974 Multi-point measurement on circumference

4.3.5 L974 Multi-point measurement on circumference
Function and application
The measuring cycle ascertains the actual value of the workpiece in relation to the workpiece
zero point and the set/actual difference.
The number of measurements and the indexing angle (=start angle) are determined on the
circumference via 2 R parameters.
The actual value and the set/actual difference are determined on the basis of the arithmetic
mean of the measuring point.
An empirical value stored in SDC is subsequently allowed for with the correct sign.
In addition, averaging is carried out over several parts and the tolerance bands are checked
(Section 1.7.1).
The probe is located at a distance "a" facing the last measuring point on completion of meas-
urement.
No automatic compensation or a length compensation is carried out, depending on the defi-
nition of R10.
Preconditions:
• The probe must have been calibrated in the direction of measurement.
• The probe must be positioned with tool offset and G53 to face the surface to be
measured (Fig. 4.9).
• The maximum diameter that can be measured depends on the traversing range of the
turret slide in +X.
Outside diameter:
D = 2×(X
max MFmax
Inside diameter:
D = 2×(X
max MFmax
4–38
_ _
X ) + 2a
F ball
_ _ _
X ) 2a
F ball
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Siemens AG 1990 All Rights Reserved
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6FC5197- AB70
SINUMERIK 840/850/880 (BN)