08.96 5 Measuring Cycles for Milling Machines and Machining Centres
5.2.2 L977 Measure shaft (paraxial)
5.2.2 L977 Measure shaft (paraxial)
Function and application
The measuring cycle measures points P1, P2, P3 and P4 at a shaft in the abscissa and
ordinate. These four measured values are used to calculate the actual shaft diameter and the
position of the shaft centre point in the abscissa and ordinate relative to the workpiece zero
point (see Fig. 5.10).
The centre point of the abscissa is calculated from points P1 and P2. The probe is then
positioned at the calculated centre point and points P3 and P4 are measured. The shaft centre
point of the ordinate and shaft diameter are calculated on the basis of these points.
The probe is located above the determined shaft centre on completion of measurement.
Refers to shaft diameter only:
An empirical value stored in the SDC is subsequently allowed for with the correct sign.
In addition, averaging is formed over several parts and the tolerance bands are checked (see
Section 1.7.1).
No automatic offset is performed or alternatively length compensation or radius offset
(difference halved) is carried out, depending on the definition of R10.
Preconditions:
• The probe must be called with tool offset and without G53.
• The probe must be positioned at the shaft centre point in the abscissa and ordinate, the
probe ball being positioned approx. 1 mm above the shaft in the applicate.
• R19 is calculated incrementally from the starting position.
©
Siemens AG 1990 All Rights Reserved 6FC5197- AB70 5–19
SINUMERIK 840/850/880 (BN)
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