Siemens SINUMERIK 840D sl Function Manual page 705

Figure 19-9
Example:
N10 A0 B0 X0 Y0 Z0 F5000
N20 T1 D1
N30 TRAORI(1)
N40 CUT3DC
N50 ORID
N60 G42 X10 Y10
N70 X60
N80 A3=1 B3=0 C3=1
N90 X10
N100 G40 X0 Y0
N120 M30
Without change in orientation
If the orientation is not changed at the block limit, then the contour need only be considered in
the plane vertical to the tool axis. In this case, the tool cross-section is a circle which touches
the two contours. The geometric relations in this plane are identical to those for 2
compensation.
With change in orientation
If the orientation changes on a block transition, the tool moves in the inside corner so that it is
constantly in contact with the two blocks forming the corner.
When the orientation changes in a block that is one of the two blocks forming the inside
corner, then it is no longer possible to adhere to the programmed relationship between path
position and associated orientation. This is because the orientation must reach its end value
even though the path end position is not reached. This response is identical to the response
of synchronized axes with 2
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
The contact points of the tool must not cross the limits of block N70 or N90 as a result of
the change in orientation in block N80
1
/ D tool radius compensation.
2
W5: 3D tool radius compensation
; Radius=5
; Transformation selection
;3D TRC selection
; TRC selection
; Change in orientation of inside corners
generated from
; N70 and N90
19.2 Circumferential milling
1
/ D
2
705