Siemens SINUMERIK 840Di Function Manual page 1832

Detailed Description
2.11 Tool lengths L1, L2, L3 assignment: LENTOAX
A change from G17 to G18 or G19 does not alter the result, because the assignment of the
length components to the geometry axes changes in the same way as the assignment of the
abscissa, ordinate and applicate.
A frame rotation of Z through 60 degrees is now programmed with G17 active, e.g., rot
Z60. The direction of the applicate (Z direction) remains unchanged; the main component of
L2 now lies in the direction of the new X axis; the main component of L1 now lies in the
direction of the negative Y axis. The return axis is thus 1, and _AXIND contains the values
(2, -3, 1).
In this case, the associated matrix _MATRIX is:
Note
For more information about the coordinate systems named above, please refer to:
References:
/PGA/ Programming Guide, Production Planning; "Tool Compensation"
2-152
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Tool Compensation (W1)