Siemens SINUMERIK 840D sl Function Manual page 1514

W1: Tool offset
18.11 Sum offsets and setup offsets
The table (or part) component of the kinematic transformation is described by the transition
from BCS to MCS.
TOWTCS
Wear values in TCS (tool coordinate system):
● If a toolholder with orientation capability is active, the tool vector is calculated as for
TOWMCS, without taking the wear into account.
● The wear data are 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 code change when a tool is active
Changing the G code 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 code 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_MIRROW_TOOL_WEAR
SD42920 $SC_WEAR_SIGN_CUTPOS
SD42930 $SC_WEAR_SIGN
SD42940 $SC_TOOL_LENGTH_CONST
SD42950 $SC_TOOL_LENGTH_TYPE
1514
Wear components
TOWSTD TOWMCS
X X
X —
X X
X X
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
TOWWCS
—
—
X
X
Basic Functions