Siemens SINUMERIK 840D sl Function Manual page 174

W1: Tool offset
2.12 Paraxial tool orientation
Standard behavior
With the default setting (SD42954 and SD42956 = 0), the tool orientation changes with a plane
change as follows:
Constant tool orientation for a plane change
If SD42954 or SD42956 are not equal to zero, a right-handed orthogonal tool coordinate
system is defined, which remains unchanged if the machining plane is changed (G17-G19).
The orientation coordinate system is determined by the orientation vector and an orientation
normal vector perpendicular to it. The basic orientation is defined by the ones and tens position
of the setting data:
Table 2-5
SD42954
= xx17
= xx18
= xx19
Table 2-6
SD42956
= xx17
= xx18
= xx19
Each value not equal to 0 and not equal to one of the three listed values is evaluated as value
"17" (for milling/special tools) or "18" (for turning/grinding tools).
Further information
A detailed description of SD42954 and SD42956 is given in the List Manual System Variables.
Note
In the case of tools whose orientation is defined by cutting edge data ($TC_DPV...), SD42954
or SD42956 is usually ignored (see Chapter "Parameterizable basic tool orientation
(Page 175)").
174
Plane change Change in tool orientation
G17 → G18 1. Rotation by -90° about the Z coordinate
G18 → G19
2. Rotation by -90° about the X coordinate
G19 → G17
G18 → G17
1. Rotation by 90° about the X coordinate
G19 → G18
2. Rotation by 90° about the Z coordinate
G17 → G19
Milling / special tools ($TC_DP1 <> 400 ... 599)
Orientation vector
Turning / grinding tools ($TC_DP1 = 400 ... 599)
Orientation vector
Coordinate system of the tool orientation
(0, 0, 1)
(0, 1, 0)
(1, 0, 0)
Coordinate system of the tool orientation
(0, 0, 1)
(0, 1, 0)
(1, 0, 0)
Orientation normal vector
(0, 1, 0)
(1, 0, 0)
(0, 0, 1)
Orientation normal vector
(0, 1, 0)
(1, 0, 0)
(0, 0, 1)
Function Manual, 06/2019, A5E47435126B AA
Tools