Siemens SINUMERIK 840D sl Programming Manual page 288

Tool radius compensation
10.2 Contour approach and retraction (NORM, KONT, KONTC, KONTT)
Example
KONTC
The full circle is approached beginning at the circle center point. The direction and curvature
radius at the block end point of the approach block are identical to the values of the next
circle. Infeed takes place in the Z direction in both approach/retraction blocks simultaneously.
The figure below shows the perpendicular projection of the tool path.
Figure 10-1
The associated NC program segment is as follows:
Program code
$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
288
Perpendicular projection
Comment
; Milling tool
; Radius 10 mm
; Approach
; Full circle
; Retract
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals