Siemens SINUMERIK 840DE Programming Manual page 372

Tool offsets
8.17 Special handling of tool offsets
TOWSTD
TOWMCS
TOWWCS
TOWBCS
TOWTCS
TOWKCS
Description
The most important distinguishing features are shown in the following table:
G code
TOWSTD
TOWMCS
TOWWCS
TOWBCS
TOWTCS
TOWWCS, TOWBCS, TOWTCS: The wear vector is added to the tool vector.
Linear transformation
The tool length can be defined meaningfully in the MCS only if the MCS is generated by
linear transformation from the BCS.
Non-linear transformation
If, for example, a non-linear transformation is active with TRANSMIT, the BCS is
automatically applied when the MCS is specified as the chosen coordinate system.
8-76
Initial setting value for offsets in tool length wear
value
Offsets in tool length in MCS
Offsets in tool length in WCS
Offsets in tool length in BCS
Offsets of tool length at toolholder reference point
(orientable toolholder)
Offsets of tool length at tool head (kinematic
transformation)
Wear value
Initial value, tool length
Wear value in MCS. TOWMCS is
identical to TOWSTD if no
orientable toolholder is
active.
The wear value is converted to
the MCS in the WCS
The wear value is converted to
the MCS in the BCS
The wear value is converted to
the MCS in the tool coordinate
system
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Active orientable toolholder
Wear values are subject to
rotation
Only the vector of the
resultant tool length
rotates. Wear is ignored
The tool vector is calculated
as with TOWMCS, i.e., the
wear value is ignored
The tool vector is calculated
as with TOWMCS, i.e., the
wear value is ignored
The tool vector is calculated
as with TOWMCS, i.e., the
wear value is ignored
Fundamentals