Spheres (Cycle997) - Siemens SINUMERIK 840D sl Programming Manual

Measuring variants
2.3 Measure workpiece (milling)
2.3.19 3D - 3 spheres (CYCLE997)
Function
This measuring variant can be used to measure three spheres of equal size, fixed to a
common base (workpiece).
Measuring individual balls is realized the same as when measuring one ball, see3D ball
(CYCLE997) (Page 150).
After measuring the 3rd ball, for a correction in a work offset (WO), the position of the
workpiece, on which the balls are mounted, is corrected as a rotation in the WO.
Measuring principle
The position of the center points of the 3 balls should be entered as a setpoint in parameters
XM1 to ZM3 in the active workpiece coordinate system. The measurement begins with the
1st ball and ends with the 3rd ball.
Positioning between the balls is realized along a straight line at the height of the starting
position of the 1st ball. The parameter settings – such as the number of measuring points,
determining the diameter, apply to all 3 balls.
Measure: 3 balls (CYCLE997),
Example of "paraxial positioning"
Correcting the work offset (WO)
After the measurement of the 3rd ball, a work offset is calculated from the measured center
points of the balls. This consists of translatory components (offset) and rotary components
(rotation), and describes the position of the workpiece, on which the balls are mounted.
During the correction, the triangle of the determined sphere center points includes the
specified center point setpoint position (workpiece coordinates). The sum of the deviations of
the balls to each other (distortion of the triangle) must be within the value of parameter TVL.
Otherwise no correction is performed and an alarm is output.
154
Measure: 3 balls (CYCLE997),
Example of "positioning on a circular path"
Programming Manual, 02/2011, 6FC5398-4BP40-0BA0
Measuring cycles