Siemens SINUMERIK 840D sl Programming Manual page 201

Beginning at the starting position, the setpoint of the sphere equator is approached initially in
-X and then in -Z. Three or four points are measured at this measuring height.
Measure: Sphere (CYCLE997),
Example of "paraxial" positioning
● Measuring variant "Paraxial positioning":
When positioning between measuring points (e.g. P1-> P2, P2->P3), the axis always
retracts to the starting position (at the north pole of the sphere).
The angular position when measuring measuring point P1 is defined using the probe angle
α0 (starting angle)
● Measuring variant "Positioning on a circular path":
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 sphere.
With probe angle α0 (starting angle), the angular position when the measuring point P1 is
defined; with α1 the incremental angle to P2 and further to P3 – and for the measuring
variant with four measuring points, to P4.
The number of measuring points multiplied with the stepping angle α1 must not exceed 360
degrees.
Internally, the actual center point of circle XY is determined from these measured values
(sphere center in the plane). Then with +Z and in XY, the axis traverses to the calculated "north
pole" of the sphere. A measurement is made there in -Z.
The complete center point of the sphere is calculated in the three axes of the plane (XYZ) from
the measuring points.
In the case of a repeat measurement, the axis traverses to the precise equator of the sphere
(from the 1st measurement); this improves the measurement result.
If the actual sphere diameter is also to be measured in addition to the sphere center point, the
cycle performs a supplementary measurement parallel to the axis at the equator in the +X
direction in the 1st measuring pass.
If "Repeat measurement" is selected, an additional measurement is not performed in the 2nd
pass (repeat pass) and the diameter is calculated internally.
The "Positioning on a circular path" measuring variant should be preferably used, because this
permits optimum positioning behavior. In addition, with this measuring variant, when circling
around the sphere, the probe can be aligned in the switching direction (see the "align probe"
parameter).
Measuring cycles
Programming Manual, 12/2017, 6FC5398-4BP40-6BA1
3.3 Measure workpiece (milling)
Measure: Sphere (CYCLE997),
Example of positioning "on a circular path"
Measuring variants
201