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

Measuring variants
2.3 Measure workpiece (milling)
2.3.18 3D - sphere (CYCLE997)
Function
This measuring variant can be used to measure a sphere. Measuring can be parallel to the
axis or on a circular path in the workpiece coordinate system.
The center point (position of the ball) for a known diameter is determined from 3 or 4
measuring points at the circumference and one measuring point at the "north pole" of the
ball. With the selection "determine ball diameter", using an additional measurement, the ball
diameter is correctly determined.
Measuring cycle CYCLE997 can measure the ball and, in addition, automatically correct a
work offset (WO) in the translational offsets of the 3rd axis of the active plane on the basis of
the position of the ball center.
Measuring principle
The following description refers to the machining plane G17:
● Axes of the plane: XY
● Tool axis: Z
Beginning at the starting position, the setpoint of the ball equator is approached initially in -X
and then in -Z. 3 or 4 points are measured at this measuring height.
Measure: Ball (CYCLE997),
Example of "paraxial" positioning
● Measuring version, "Paraxial" positioning:
● Measuring version, positioning "on a circular path":
150
When positioning between measuring points (e.g. P1-> P2, P2->P3), the axis always
retracts to the starting position (at the north pole the ball).
Positioning between measuring points (e.g. P1-> P2, P2->P3) is realized on a circular
path at the same height as the equator of the ball.
With probe angle α0 (starting angle), the angular position when the measuring
measuring point P1 is defined; withα1 the incremental angle to P2 and further to P3 –
and for the measuring version with 4 measuring points, to P4.
Measure: Ball (CYCLE997),
Example of positioning "on a circular path"
Programming Manual, 02/2011, 6FC5398-4BP40-0BA0
Measuring cycles