Siemens SINUMERIK 840Di sl Programming Manual page 356

Tool offsets
8.9 Contour approach and retraction (NORM, KONT, KONTC, KONTT)
Example of KONTC
The full circle is approached beginning at the circle center point. The direction and curvature
radius of the approach circle at the block end point are identical to the values of the next
circle. Infeed takes place in the Z direction in both approach/retraction blocks
simultaneously. The adjacent diagram shows the vertical projection of the path.
The associated NC program segment is as follows:
$TC_DP1[1.1]= 121
$TC_DP6[1.1]=10
N10 G1 X0 Y0 Z60 G64 T1 D1
F10000
N20 G41 KONTC X70 Y0 Z0
N30 G2 I-70
N40 G40 G1 X0 Y0 Z60
N50 M30
3D representation: At the same time the curvature is adjusted to the circular path of the full
circle, the axes moves from Z60 to the plane of circle Z0.
356
;Milling tool
;Radius 10 mm
;Approach
;Full circle
;Retract
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals