Siemens SINUMERIK 840D sl Function Manual page 243

Figure 3-3
See also "Example 2: Orientation change at inside corner during 3D circumferential milling
(Page 271)".
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.
Tools
Function Manual, 06/2019, A5E47435126B AA
Path end position and change in orientation at inside corners
W5: 3D tool radius compensation
3.1 Function
243