Siemens SINUMERIK 840D sl Function Manual page 1487

System variable $TC_DPV[t, d]
The purpose of system variable $TC_DPV[t, d] is to allow the simple specification of certain
basic orientations (parallel to coordinate axes) that are required frequently. The permissible
values are shown in the table below. The values in the first and second/third columns are
equivalent.
$TC_DPV[t, d]
≤ 0 or > 6
1
2
3
4
5
6
*
**
V
Example:
For milling tools:
$TC_DPV[t, d] = 2 is equal to:
$TC_DPV3[t, d] = 0, $TC_DPV4[t, d] = 0, $TC_DPV5[t, d] = V.
Supplementary conditions
If the "Scratch" function is used in the RESET state, the following must be noted with respect
to the initial setting:
● The wear components are evaluated depending on the initial settings of the G-code groups
TOWSTD, TOWMCS and TOWWCS.
● If a value other than the initial setting is needed to ensure correct calculation, scratching
may be performed only in the STOP state.
Note
"Special handling of tool compensations" pays particular attention to tool compensations
with evaluation of sign for tool length with wear and temperature fluctuations.
The following are taken into account:
● Tool type
● Transformations for tool components
● Assignment of tool length components to geometry axes independently of tool type
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Turning tools in this context are any tools whose tool type ($TC_DP1[t, d]) is between 400 and
599. All other tool types refer to milling tools.
If all three values $TC_DPV3[t, d], $TC_DPV4[t, d], $TC_DPV5[t, d] are equal to zero in this
case, the tool orientation is determined by the active machining plane (default).
Stands for a positive value in the corresponding system variables.
Basic orientation
Milling tools *
($TC_DPV5[t, d],
$TC_DPV4[t, d],
$TC_DPV3[t, d],) **
(0, 0, V)
(0, V, 0)
(V, 0, 0)
(0, 0, -V)
(0, -V, 0)
(-V, 0, 0)
W1: Tool offset
18.9 Basic tool orientation
Turning tools *
($TC_DPV3[t, d],
$TC_DPV5[t, d],
$TC_DPV4[t, d],) **
(0, V, 0)
(0, 0, V)
(V, 0, 0)
(0, -V, 0)
(0, 0, -V)
(-V, 0, 0)
1487