Programming; Selecting 3D Tool Radius Compensation For 3D Circumferential Milling (Cut3Dc, Cut3Dcd, Isd) - Siemens SINUMERIK 840D sl Function Manual

The lower the value of MD21080, the higher the computation effort generally is, which is
needed to check adherence to the cited conditions. Exceptions apply to linear blocks with
constant orientation.
Minimal angle between surface normal vector and tool orientation
In 3D face milling, the following machine data specifies the minimum angle which the surface
normal vector and tool orientation must form in each point of the path if you are working with a
side angle that is not equal to zero and the tool is not a cherry:
MD21082 $MC_CUTCOM_PLANE_ORI_LIMIT
If this value is undershot, processing is canceled with an alarm.
The lower the value of MD21082, the higher the computation effort generally is, which is
needed to check adherence to the cited conditions.
MD21082 has no effect in linear blocks with constant orientation. In this case, angles of any size
are permitted, even if the side angle is not equal to zero.
Minimal angle between surface normal vector and path tangent vector
During 3D face milling, the following machine data specifies the minimum angle which the
surface normal vector and path tangent vector must form in each point of the path:
MD21084 $MC_CUTCOM_PLANE_PATH_LIMIT
If this value is undershot, processing is canceled with an alarm.
The lower the value of MD21084, the higher the computation effort generally is, which is
needed to check adherence to the cited conditions.
Interpolation of the surface normals via polynomials
In order to use smoothing of the surface normal in 3D face milling, the function "Interpolation of
the surface normal via polynomials" must be enabled:
MD28291 $MC_MM_SMOOTH_SURFACE_NORMALS = TRUE
If MD28291 is not set, processing is canceled with an alarm.
3.3

Programming

3.3.1 Selecting 3D tool radius compensation for 3D circumferential milling (CUT3DC,
CUT3DCD, ISD)
The 3D tool radius compensation (3D TRC) for the 3D circumferential milling without taking
limitation surfaces into account is selected with the modally effective G command CUT3DC or
CUT3DCD.
The actual activation is performed with G41 or G42 The tool radius compensation is
deactivated with G40.
Tools
Function Manual, 06/2019, A5E47435126B AA
W5: 3D tool radius compensation
3.3 Programming
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