Siemens SINUMERIK 840D Manual page 48

3.5
Example
involving TRAORI
48
Key functions for 5-axis machining
3.5.2 5-axis transformation - From workpiece program to
machine movement
Normally, NC programs are created in relation to the workpiece, i.e. all the tool positions relate to
the workpiece coordinate system (WCS). In order for an NC program to be executed on the
machine, the positions must be transformed into axis movements, i.e. converted into the
machine coordinate system (MCS). The SINUMERIK is equipped with the TRAORI function to
enable this kind of transformation.
What does the TRAORI function do?
If there is a change in tool orientation with stationary tool tip (traverse rotary axes only), the
necessary compensating movements are calculated in X, Y, and Z
Tool lengths taken into account
Programmed feedrate made to relate to tool tip
.
Without TRAORI
A change in orientation affecting the B axis is
programmed in the NC program without a tool
tip traversing motion. The control simply
rotates the axis; the tool tip does not remain
stationary.
© Siemens AG All rights reserved. SINUMERIK, Manual, 5-axis machining
With TRAORI
The control recognizes that it is merely a
change in orientation that has been pro-
grammed; it ensures that the tool tip remains
stationary and swivels the B axis.