Siemens SINUMERIK 840D sl Programming Manual page 162

Measuring variants
2.3 Measure workpiece (milling)
With the 2nd and 3rd measurements, the rotary axis to be measured is rotated around the
largest possible angle. The position of the calibration ball must be stationary during the
measurements.
Note
Measure kinematics is also possible with active 5-axis transformation (TRAORI).
Preconditions for this are roughly set vectors of the 5-axis transformation. The positions for
measuring the kinematics are approached in the user program with active transformation.
During the actual measurement with the calibration ball,
transformation and switches it on again after the measurement.
Starting position before the measurement
A rotary axis is measured by calling CYCLE996 3 times (measurements 1 to 3).
The probe ball must be able to reach the equator of the calibration ball. The 1st
measurement must take place in the kinematics normal position. If a rotary axis rotates
parallel to the spindle without offset in a head kinematics (fork head), the 1st measurement
can be made with applied probe. The rotary axis that is not to be measured is not in the
initial position of the kinematics.
The starting position of the probe must be approached by the user or from the user program
(see example program). The probe must be prepositioned in the direction of the tool
orientation (ORI) above the highest point of the calibration ball (probe aligned with ball center
point). After approaching the starting position, the distance (D) from the calibration ball
should be as short as possible.
Position after the end of the measuring cycle
After each measurement (1 to 3) of a rotary axis, the probe is located above the calibration
ball at a maximum distance of the measurement path DFA.
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
● Specify and approach the three ball positions with the probe in a linear movement/in
● Using CYCLE996, scan all three ball positions of the calibration ball with the probe.
162
(user)
linear movements (user)
switches off the
CYCLE996
Programming Manual, 02/2011, 6FC5398-4BP40-0BA0
Measuring cycles