Calibrating A Workpiece Probe In A Hole Of Unknown Hole Center Point; General Information - Siemens SINUMERIK 840D sl Programming Manual

5.3.3

Calibrating a workpiece probe in a hole of unknown hole center point

5.3.3.1

General information

Function
Using the measuring cycle and the _MVAR=xx0x08
measuring variant, it is possible to calibrate the probe in the axes of the plane (G17, G18, or
G19) in a calibration ring. A hole that is perpendicular to the selected plane and with the
same quality requirements regarding geometrical accuracy and surface roughness can also
be used.
The center (CP) of the hole is unknown in the precise position. But diameter (D) is known.
In this measuring variant first the hole center and then the positional deviation (skew) of the
probe is calculated. Then the trigger points in all 4 axis directions on the plane are
calculated.
In addition to the values in array _WP[ ], the measuring cycle also provides the determined
hole center point in result array _OVR[6], _OVR[7].
Calibration can be performed paraxially or at an angle to the active workpiece coordinate
system. All 4 axis directions are always calibrated.
Prerequisite
● The probe must be called with tool length offset.
● Tool type, preferably: 710.
● The exact diameter of the hole is known.
● The spindle must be SPOS-capable.
● Probe in spindle can be positioned 0...360 degrees (all-round coverage).
Measuring cycles
Programming Manual, 03/2009 Edition, 6FC5398-4BP10-2BA0
NOTICE
The first time calibration is performed the default setting in the array of the probe is still
"0". For that reason _TSA> probe ball radius must be programmed to avoid alarm "Safe
area violated".
Measuring Cycles for Milling and Machining Centers
5.3 CYCLE976 calibrate workpiece probe
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