Siemens SINUMERIK 840C User Manual

5 Measuring Cycles for Milling Machines and Machining Centres 08.96
5.2.6 L977 ZO determination on shaft
5.2.6 L977 ZO determination on shaft
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 position of the shaft centre point in the
abscissa and ordinate in relation to the workpiece zero point (see Fig. 5.14).
Points P1 and P2 are used to calculate the centre point of the abscissa. The probe is then
positioned at the centre point calculated and points P3 and P4 are measured. These two
points provide the shaft centre point of the ordinate.
The difference is determined from the set centre point (start position) and the centre point
determined.
The multiplication factor for measurement path ”2a” makes it possible to take into account the
variation range of the blanks (set value).
The probe is located above the shaft centre point when measurement is completed.
No automatic ZO entry is carried out or alternatively additive input of the difference of the two
measuring axes is performed in the ZO memory specified, 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.
The following parameters must be defined prior to call:
Parameters Description
R10 = 0
= 1...4
= 5
No automatic ZO determination
Automatic ZO entry in ZO G54 ... G57
Automatic ZO entry in ZO G58
R13 = 0...359.5 Compensation angle position for monodirectional probe (see
Section 2.5)
R19 Incremental infeed of applicate with sign (travel over the shaft)
R22 Probe type/probe number (see Section 2.6)
R23 = 22 ZO determination at shaft
R25
R25 = 0
Variable measuring speed in mm/min
Standard cycle value
R27 = 1...R
max
Number of measurements at same location (typically 1...3)
R28 = 1...R
max
Multiplication factor for measurement path ”2a”
R32 Set value diameter
R36 Safe area (centre point coordinates)
See Section 10.2 for result display parameters.
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Siemens AG 1990 All Rights Reserved 6FC5197- AB70
SINUMERIK 840/850/880 (BN)

Siemens SINUMERIK 840C Specifications

General

Brand	Siemens
Model	SINUMERIK 840C
Category	Control Unit
Language	English