Siemens SINUMERIK 840D sl Programming Manual page 72

Measuring variants
2.2 Measure workpiece (turning)
Positioning "Travel below the center" (CYCLE994)
For "Travel below the center", the inside diameter of the workpiece is measured using a 2-
point measurement with the measuring cycle
symmetrical to the workpiece zero (center of rotation) are approached at a distance of the
setpoint specified by the user.
A protection zone can be programmed, which should be taken into account when traversing.
The user must take into account the ball radius of the probe when dimensioning the
protection zone.
Figure 2-6
Measuring with reversal of the workpiece (CYCLE974)
With this measuring version, the actual value of a workpiece with reference to the workpiece
zero in the measuring axis, is determined by acquiring two opposite points on the diameter.
The workpiece is positioned by the cycle before the first measurement at the angular position
programmed in parameter α0. After the 1st measurement, the cycle also automatically
generates the 180 degree reversal before the second measurement. The mean value is
calculated from both measured values.
A correction of the work offset (WO) is only possible when measuring without reversal (1-
point measurement).
Preconditions
● The probe must be calibrated in the measuring direction.
● The probe type is 580 and must be active.
● The cutting edge position can be 5 to 8 and must be suitable for the measurement task.
Starting position before the measurement
The probe should be positioned opposite the surface to be measured, above the turning
center.
72
Positions of the probe when measuring the inner diameter using 2-point measurement
(CYCLE994)
. Two opposite measuring points
CYCLE994
Programming Manual, 02/2011, 6FC5398-4BP40-0BA0
Measuring cycles