10.91 5 Measuring Cycles for Milling Machines and Machining Centres
5.2.1 L977 Measure hole (paraxial)
5.2.1 L977 Measure hole (paraxial)
Function and application
The measuring cycle measures points P1, P2, P3 and P4 in the abscissa and ordinate. These
four measured values are used to calculate the actual value of the hole diameter and the po-
sition of the hole centre point in the abscissa and ordinate relative to the workpiece zero point
(see Fig. 5.9).
The centre point of the abscissa is calculated from points P1 and P2. The probe is then posi-
tioned to the calculated centre point and points P3 and P4 are measured. These two points
are used to calculate the hole centre point of the ordinate and the hole diameter.
The probe is at the determined hole centre on completion of measurement.
Refers to hole diameter only:
An empirical value stored in the SDC is subsequently allowed for with the correct sign.
In addition, averaging is performed over a number of parts and the tolerance bands are
checked (see Section 1.7.1).
No automatic offset is carried out or alternatively length compensation or radius compensation
(difference halved) is performed, depending on the definition of R10.
Preconditions :
• The probe must be called with tool offset and without G53.
• The probe must be positioned to the hole centre point in the abscissa and ordinate and the
probe ball must be positioned within the hole to the measuring height.
©
Siemens AG 1990 All Rights Reserved 6FC5197- AB70 5–15
SINUMERIK 840/850/880 (BN)
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