Measuring Tool - Siemens SINUMERIK 840D sl Programming Manual

6.3.3

Measuring tool

Function
This cycle and its various measuring variants are for measuring:
_MVAR=1: Turning tools (machine-related)
This variant is described in detail section "Measure turning tool (machine-related)".
_MVAR=11: Turning tools (workpiece-related)
_MVAR=xxx01: Milling tools, drills (machine-related)
_MVAR=xxx11: Milling tools, drills (workpiece-related)
Workpiece-related or machine-related measurement require an appropriately calibrated tool
probe (see section "Calibrating tool probes" or "Calibrating tool probes (machine-related)").
These measuring variants can only determine offset values that are in the measurement axis
_MA.
The cycle determines the new tool length (L1 or L2), for milling tools the radius too, and
checks whether the difference from the old tool length can be corrected within a defined
tolerance range:
Upper limits: Safe area _TSA and dimensional deviation check _TDIF,
Lower limit: Zero offset range _TZL.
If this range is not violated, the new tool length is accepted, otherwise an alarm is output.
Violation of the lower limit is not corrected.
Compensation strategy
The tool measuring cycle is provided for various applications:
● Initial measurement of a tool(_CHBIT[3]=0):
● Remeasurement of a tool (_CHBIT[3]=1):
Empirical values may optionally be included. The mean value is not calculated.
If _CHBIT[20]=1, positioning of the milling spindle at the value of _STA1 can be suppressed.
That is possible with the following milling cutter measuring variants:
_MVAR=xxx001 (with x: 0 or 1, no other values).
Measuring cycles
Programming Manual, 03/2009 Edition, 6FC5398-4BP10-2BA0
– The tool offset values in geometry and wear are replaced.
– The offset is applied in the geometry component of the length.
– The wear component is deleted.
The resulting difference is calculated into the wear component (radius or length).
Measuring Cycles for Turning Machines
6.3 CYCLE982 tool: Measure turning and milling tools
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