Siemens Sinumerik 840D sl Programming Manual page 427

This borderline case is monitored by the control that detects abrupt changes in the machining
point on the basis of angular approach motions between the tool and normal surface vectors.
The control inserts linear blocks at these positions so that the motion can be executed.
These linear blocks are calculated on the basis of permissible angular ranges for the side
angle stored in the machine data. The system outputs an alarm if the limit values stored in the
machine data are violated.
Path curvature
Path curvature is not monitored. In such cases, it is also advisable to use only tools of a type
that do not violate the contour.
Insertion depth (ISD)
Insertion depth ISD is only evaluated when 3D tool radius compensation is active.
Program command ISD (insertion depth) is used to program the tool insertion depth for
circumferential milling operations. This makes it possible to change the position of the
machining point on the outer surface of the tool.
Syntax
3D tool compensation circumference milling
CUT3DC
ISD=<value>
Significance
CUT3DC
ISD
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
Activate 3D tool offset for circumferential milling, e.g., for pocket milling with
oblique side walls.
The clearance (<value>) between the milling tool tip (FS) and the milling tool
construction point (FH) are specified using the command ISD.
7.5 Activate 3D tool offsets (CUT3DC..., CUT3DF...)
Tool offsets
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