Siemens SINUMERIK 840D sl Programming Manual page 223

Tolerance limits
Activating tolerance limits when parameterizing CYCLE996 (compare Starting values –
calculated values), allows conclusions to be drawn regarding unusual changes in the
mechanical kinematic chain. The unintentional automatic overwriting of starting values can be
avoided by adjusting the tolerance limits.
Note
The rotary axis vectors V1/V2 (orientation of the rotary axes) are never automatically
overwritten.
Primarily, the calculated rotary axis vectors enable an assessment to be made regarding the
mechanical desired/actual state of the kinematics. Depending on the kinematics configuration,
even the smallest and corrected deviations in the position of the rotary axis vectors can result
in large compensating movements.
Normalizing = setting a fixed value
Through normalizing, a new fixed value can be calculated in an axis direction (XYZ) for each
rotary axis. This is required particularly for table kinematics because the result of the kinematics
calculation refers to the measurement height of the calibration sphere. By normalizing, you
can, for example, calculate the Z component to the reference point of the workpiece table.
In head kinematics, when calculating the kinematics, the initial state of the 1st measurement
of rotary axis 2 (if available, otherwise rotary axis 1) is calculated. Normalizing is therefore
usually not required for head kinematics. With orthogonal machine kinematics, the normalizing
of a rotary axis only makes sense for a specific axis direction.
Example:
Table kinematics
Rotary axis 2(C) rotates around Z -> normalizing of rotary axis 2(C) in axis direction Z makes
sense.
With normalizing "Yes," the value of the normalizing (fixed value) is written to the following
linear vectors:
Head kinematics
Table kinematics
Mixed kinematics
Example:
Table kinematics, rotary axis 1(A) rotates around X, rotary axis 2(C) rotates around Z.
Normalizing of rotary axis 1(A) X=100 -> I2x=100
Normalizing of rotary axis 2(Z) Z=0 -> I4z=0
Measuring cycles
Programming Manual, 12/2017, 6FC5398-4BP40-6BA1
Rotary axis 1
I1
I2
I2
Measuring variants
3.3 Measure workpiece (milling)
Rotary axis 2
I3
I4
I4
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