Siemens SINUMERIK 840D sl Programming Manual page 84

Tool offsets
5.8 Programmable tool offset (TOFFL, TOFF, TOFFR)
Significance
TOFFL:
TOFF:
<geometry axis>
TOFFR:
<value>:
Note
The TOFFR command has almost the same effect as the OFFN command (see "Tool radius
compensation (G40, G41, G42, OFFN) [Page 277]"). 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).
84
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 is applied in the same direction
as the tool length component L1, L2 or 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
determined by the tool type and the current working plane (G17/
G18/G19).
Command for the compensation of the tool length in the
component parallel 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 transformation) 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 geometry axes, but 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
compensation by the programmed offset value.
Offset value for the tool length or radius
Type: REAL
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals