Siemens SINUMERIK 840D sl Programming Manual page 461

Further information
Distinguishing features
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
For example, if with TRANSMIT a non-linear transformation is active, then when specifying
the MCS as requested coordinate system, BCS is automatically used.
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
Wear value
Initial value, tool length
Wear value in MCS. TOWMCS is
identical to TOWSTD if a tool holder
that can be orientated is not 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 workpiece coordinate
system.
7.3 Special handling of tool offsets
Active orientable toolholder
Wear values are subject to rotation.
It only rotates the vector of the
resultant tool length without taking
into account the wear.
The tool vector is calculated as for
TOWMCS without taking into account
the wear.
The tool vector is calculated as for
TOWMCS without taking into account
the wear.
The tool vector is calculated as for
TOWMCS without taking into account
the wear.
Tool offsets
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