Siemens SINUMERIK 840Di Function Manual page 1782

Detailed Description
2.5 Toolholder with orientation capability
Toolholder from G code of group 53
The G codes of group 53 (TOFRAME, TOROT, etc.) can be used to define a frame such that
an axis direction (Z, Y or X) in this frame is equal to the current tool orientation.
The G code of group 6 (G17 - G19), which is active at the time TOFRAME is called,
determines the tool orientation.
If no toolholder is active, or if a toolholder is active but does not cause the tool orientation to
change, the Z direction in the new frame is:
• The same as the old Z direction with G17
• The same as the old Y direction with G18
• The same as the old X direction with G19.
These directions are modified accordingly for rotating toolholders. The same applies to the
new X and Y directions.
Instead of TOFRAME or TOROT, one of the G codes TOFRAMEX, TOFRAMEY, TOROTX, or
TOROTY can be used. The meanings of the axes are interchanged accordingly.
Group change
Changing the G code from group 42 (TCOABS, TCOFR, etc.) causes recalculation of the tool
length components.
The (programmed) angles of rotation stored in the toolholder data are not affected, with the
result that the angles originally stored in the toolholder data are reactivated on a change
from TCOFR to TCOABS.
Read rotary angle (α
The angles currently used to calculate the orientation can be read via system variable
$P_TCANG[n] where n = 1 or n = 2.
If two permissible solutions (i.e., a second valid pair of angles) are available for a particular
orientation, the values can be accessed with $P_TCANG[3] or $P_TCANG[4]. The number of
valid solutions 0 to 2 can be read with $P_TCSOL.
Tool radius compensation with CUT2D or CUT3DFS:
The current tool orientation is included in the tool radius compensation if either CUT2D or
CUT3DFS is active in G-code group 22 (tool compensation type).
For non-rotating toolholders, the behavior depends solely on the active plane of G code
group 6 (G17 - G19) and is, therefore, identical to the previous behavior.
2-102
or α ):
1 2
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Tool Compensation (W1)