Siemens SINUMERIK 840D sl Programming Manual page 450

Tool offsets
7.1 Offset memory
Basic value and wear value
The resultant values are each a total of the basic value and wear value (e.g. $TC_DP6 +
$TC_DP15 for the radius). The basic measurement ($TC_DP21 – $TC_DP23) is also added
to the tool length of the first cutting edge. All the other parameters, which may also impact on
effective tool length for a standard tool, also affect this tool length (adapter, orientational
toolholder, setting data).
Limit angles 1 and 2
Limit angles 1 and 2 each relate to the vector of the cutting edge center point to the cutting
edge reference point and are counted clockwise.
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Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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