Tolerance Limits; Setting A Fixed Value (Scaling) - Siemens SINUMERIK 840D sl Programming Manual

Measuring variants
3.3 Measure workpiece (milling)
3.3.25.6

Tolerance limits

Tolerance of the offset vectors (TLIN)
Activating the tolerance limits when parameterizing CYCLE9960 (compare Starting values –
calculated values), allows conclusions to be drawn regarding unusual changes in the
kinematics. The unintentional automatic overwriting of starting values can be avoided by
adjusting the tolerance limits.
Tolerance of the direction vectors of the rotary axes
Primarily, the calculated rotary axis vectors enable an assessment to be made regarding the
mechanical set/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.
The maximum permissible angular deviation of the calculated rotary axis vectors can be
specified with SD $SN_CORR_TRAFO_DIR_MAX.
Note
The rotary axis vectors V1/V2 (orientation of the rotary axes) are never automatically
overwritten.
Tolerance monitoring of the sphere diameter
When setting data 55644 $SCS_MEA_KIN_DM_TOL > 0, the measured calibration sphere
diameter is checked after each measurement. If the deviation is greater than in setting data
$SCS_MEA_KIN_DM_TOL, fault 62321 or 62322 is output.
62321 rotary axis 1: Tolerance, diameter of calibration sphere between measurement %4
exceeded.
62322 rotary axis 2: Tolerance, diameter of calibration sphere between measurement %4
exceeded.
3.3.25.7

Setting a fixed value (scaling)

A fixed value can be set in an axis direction (X, Y, Z) 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. With the fixed value, you can, for example,
calculate the Z component to the reference point of the workpiece table.
Setting a fixed value only makes sense for specific axis directions.
Example
Table kinematics
● Rotary axis C rotates around Z → Set a fixed value for rotary axis C in axis direction Z.
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Programming Manual, 12/2017, 6FC5398-4BP40-6BA1
Measuring cycles