Siemens SINUMERIK 840Di sl Programming Manual page 322

Tool offsets
8.1 General notes
Any tool parameters that are not required must be set to "zero".
Description
Tool length compensation
This value compensates for the differences in length between the tools used.
The tool length is the distance between the toolholder reference point and the tip of the tool.
This length is measured and entered in the control together with definable wear values. From
this data, the control calculates the traversing movements in the infeed direction.
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Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals