Siemens SINUMERIK 840D sl Programming Manual page 295

Significance
G450:
DISC:
G451:
Note
DISC only applies with call of G450, but can be programmed in a previous block without
G450. Both commands are modal.
Example
Program code
N10 G17 T1 G0 X35 Y0 Z0 F500
N20 G1 Z-5
N30 G41 KONT G450 X10 Y10
N40 Y60
N50 X50 Y30
N60 X10 Y10
N80 G40 X-20 Y50
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
10.3 Compensation at the outside corners (G450, G451, DISC)
G450 is used to travel around workpiece corners on a circular path.
Flexible programming of the circular path with G450 (optional)
Type: INT
<value>:
Range of values: 0, 1, 2 to 100
Significance:
G451 is used to approach the intersection point of the two equidistant paths in
the case of workpiece corners. The tool backs off from the workpiece corner.
0 Transition circle
100 Intersection of the equidistant paths
(theoretical value)
In this example, a transition radius is
programmed for all outside corners
(corresponding to the programming of the
corner behavior in block N30). This prevents
the tool stopping and backing off at the
change of direction.
Comment
; Starting conditions
; Feed in tool.
; Activate TRC with KONT approach/retract mode and
corner behavior G450.
; Mill the contour.
; Deactivate compensation mode, retraction on
transition circle.
Tool radius compensation
295