Siemens SINUMERIK 840D sl Function Manual page 706

W5: 3D tool radius compensation
19.2 Circumferential milling
Figure 19-10 Path end position and change in orientation at inside corners
Change in insertion depth
Generally speaking, the contour elements that form an inside corner are not positioned on the
plane perpendicular to the tool. This means that the contact points between the two blocks
and the tool are at different distances from the tool tip.
This means: the insertion depth (ISD) changes abruptly from the 1st to the 2nd block at an
inside corner.
To ensure that this difference in depth is not an abrupt step change, it is distributed
continuously among the blocks involved during interpolation. The depth-compensating motion
is executed in the current tool direction.
This solution prevents the contour from being violated by cylindrical tools if the length of the
tool prevents the cutter contact point on the lateral surface of the cutter leaving the range in
which machining is possible.
706
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions