Siemens SINUMERIK 840D sl Programming Manual page 219

Measuring an individual rotary axis
The following steps must be carried out in order to measure a rotary axis:
● Mount the calibration ball on the machine table (user)
● Define and approach the three ball positions with the rotary axis that is to be measured
(user)
● Specify and approach the three ball positions with the probe in a linear movement/in linear
movements (user)
● Using
Mounting the calibration ball
In the case of machinery, the calibration ball is to be installed on the machine table.
In order to measure kinematics for swivel-mounted workholders, the ball must be incorporated
into the appropriate workholder. In all cases it must be ensured that the probe can approach
and bypass the mounted calibration ball without collision in all the selected rotary axis positions.
Considering the need to avoid collisions, the calibration ball should be mounted as far as
possible from the center of rotation of the rotary axis that is to be measured.
If the three ball positions result in too small a triangle, this will negatively affect the accuracy
of the procedure:
Calibration ball mounted sufficiently far from
the center of rotation; large triangle can be
clamped
Note
While measuring a rotary axis, the mechanical hold-down of the calibration ball must not be
altered. It is only with table and mixed kinematics that different calibration ball mounting
positions are permissible for the purpose of measuring the first and subsequent rotary axes.
Measuring cycles
Programming Manual, 12/2017, 6FC5398-4BP40-6BA1
CYCLE996 , scan all three ball positions of the calibration ball with the probe.
3.3 Measure workpiece (milling)
Calibration ball mounted too near the center of
rotation; clamped triangle is too small
Measuring variants
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