Siemens SINUMERIK 840D sl Function Manual page 205

TOWTCS
Wear values in TCS (tool coordinate system):
● If a tool carrier with orientation capability is active, the tool vector is calculated as for
TOWMCS, without taking the wear into account.
● The wear data is interpreted in the tool coordinate system.
The wear vector in the TCS (Tool Coordinate System) is converted to the machine coordinate
system by way of the tool coordinate system of the kinematic transformation (KCS) and added
to the tool vector.
TOWKCS
The wear value specifications for the kinematic transformation are interpreted in the associated
TCS (Tool Coordinate System).
The wear vector is converted to the machine coordinate system by way of the tool coordinate
system of the kinematic transformation and added to the tool vector.
G command change when a tool is active
Changing the G command in the group TOWSTD, TOWMCS, TOWWCS, TOWBCS,
TOWTCS, and TOWKCS does not affect an already active tool, and does not become effective
until the next tool is selected.
A new G command of this group will also come into effect if it is programmed in the same block,
in which a tool is selected.
Evaluation of individual wear components
Evaluation of individual wear components (assignment to geometry axes, sign evaluation) is
influenced by:
● The active plane
● The adapter transformation
● The five setting data shown in the table below
Setting data
SD42910 $SC_MIRROR_TOOL_WEAR
SD42920 $SC_WEAR_SIGN_CUTPOS
SD42930 $SC_WEAR_SIGN
SD42940 $SC_TOOL_LENGTH_CONST
SD42950 $SC_TOOL_LENGTH_TYPE
Note
Wear components which are subjected to an active rotation by an adapter transformation or a
tool carrier with orientation capability are referred to as non-transformed wear components.
Tools
Function Manual, 06/2019, A5E47435126B AA
2.15 Sum and setup offsets
Wear components
TOWSTD TOWMCS
X X
X —
X X
X X
W1: Tool offset
TOWWCS
—
—
X
X
205