Siemens Sinumerik 840D sl Programming Manual page 74

Tool offsets
6.8 Programmable tool offset (TOFFL, TOFF, TOFFR)
Meaning
TOFFL:
TOFF:
<geometry axis>:
TOFFR:
<value>:
Note
The TOFFR command has almost the same effect as the OFFN command (see "Tool radius
compensation (Page 247)"). There is only a difference with active peripheral curve
transformation (TRACYL) and active slot side compensation. In this case, the tool radius is
affected by OFFN with a negative sign, but by TOFFR with a positive sign.
OFFN and TOFFR can be effective simultaneously. They then generally have an additive effect
(except for slot side compensation).
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Command for the compensation of the effective tool length
TOFFL can be programmed with or without index:
● Without index: TOFFL=
The programmed offset value is applied in the same direction as the
tool length component L1 stored in the compensation memory.
● With index: TOFFL[1]=, TOFFL[2]= or TOFFL[3]=
The programmed offset value acts in the same direction as the tool
length component L1, L2 or L3 L3 stored in the offset memory.
The commands TOFFL and TOFFL[1] have an identical effect.
Note:
How these tool length offset values are calculated in the axes is deter‐
mined by the tool type and the current working plane (G17/G18/G19).
Command for the compensation of the tool length in the component par‐
allel to the specified geometry axis
TOFF is applied in the direction of the tool length component which is
effective with non-rotated tool (orientable toolholder or orientation trans‐
formation) parallel to the <geometry axis> specified in the index.
Note:
A frame does not influence the assignment of the programmed values to
the tool length components, i.e. the workpiece coordinate system (WCS)
is not used for the assignment of the tool length components to the ge‐
ometry axes, but rather the tool in the basic tool position.
Identifier of the geometry axis
Command for the compensation of the effective tool radius
TOFFR changes the effective tool radius with active tool radius compen‐
sation by the programmed offset value.
Offset value for the tool length or radius
Type: REAL
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals