Siemens SINUMERIK 840D sl Programming Manual page 174

Measuring Cycles for Milling and Machining Centers
5.3 CYCLE976 calibrate workpiece probe
5.3.3.3 Operational sequence
Position before measuring cycle call
The probe must be positioned near the hole center in the abscissa and the ordinate of the
selected measuring plane and at the calibration height in the hole.
Axis sequence, axis direction sequence
• Paraxial:
• At an angle:
2 measuring runs, one with spindle reversal
The cycle performs two measurement operations to determine the positional deviance of the
probe and the center point of the hole.
1. Spindle positioned 180 degrees from initial position with SPOS and all axis directions
2. Spindle positioned at initial position and all axis directions traversed again.
Position after end of measuring cycle
When calibration is complete the probe is again positioned at calibration height in the center
of the hole.
Note
Repeating calibration using the determined hole center is advisable if the starting position at
the beginning is severely eccentric or measuring accuracy demands are high.
5-40
Calibration always starts in the positive axis direction, first in the abscissa, then in the
ordinate.
The axes always travel in combination acc. to starting angle _STA1, _STA1+180 degrees,
_STA1+90 degrees, and _STA1+270 degrees.
Otherwise, the same principle as for "paraxial" applies.
traversed.
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
Measuring cycles