L978 Angular Measurement (Zo Determination) - Siemens SINUMERIK 840 User Manual

5 Measuring Cycles for Milling Machines and Machining Centres

5.4.4 L978 Angular measurement (ZO determination)

5.4.4 L978 Angular measurement (ZO determination)
Function and application
The cycle makes it possible to determine the angular position or clamping position of a
workpiece in relation to the set angle value R24 in relation to the offset axis (Fig. 5.27).
An empirical value stored in the SDC is subsequently allowed for with the correct sign.
The multiplication factor for measurement path "2a" makes it possible to take into account the
variation range of the blanks (set value).
The probe faces the measuring surface by the amount "a" on completion of measurement.
No automatic ZO entry is carried out or alternatively additive input of the rotary axis
difference (R31) is performed in the specified ZO memory, depending on the definition of
R10.
When differential measurement is selected (R23 = 13) only MP1 is measured twice.
Preconditions:
• The probe must be positioned with tool offset and without G53 to face the first measuring
point (MP1, see Fig. 5.26).
• Parameter R19 is used to specify the distance in the offset axis between MP1 and MP2
(positive values only).
• Measurement path "m" in the measuring axis must be less than the offset path (R19) (see
Fig. 5.26).
It is therefore only possible to measure an angle of max. 44.999 degrees. However, the
measurement can be performed from all sides.
The angle setpoint is the angle between the offset axis and the workpiece edge.
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SINUMERIK 840/850/880 (BN)
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