Siemens SINUMERIK 840D sl Programming Manual page 132

Fundamentals
2.7 Feed control
Meaning
CFTCP:
CFC:
CFIN:
Example
In this example, the contour is first produced with a CFC-corrected feedrate. During finishing,
the cutting base is also machined with CFIN. This prevents the cutting base being damaged at
the outside radii by an excessively high feedrate.
Program code
N10 G17 G54 G64 T1 M6
N20 S3000 M3 CFC F500 G41
N30 G0 X-10
N40 Y0 Z-10
N50 CONTOUR1
N40 CFIN Z-25
N50 CONTOUR1
N60 Y120
N70 X200 M30
132
Constant feedrate on the milling cutter center path
The control keeps the feedrate constant and feedrate overrides are deactivated.
Constant feedrate at the contour (tool cutting edge).
This function is preset per default.
Constant feedrate at the tool cutting edge only at concave contours, otherwise on the
milling cutter center path.
The feedrate is reduced for inside radii.
Comment
; Feed to first cutting depth
; Subprogram call
; Feed to second cutting depth
; Subprogram call
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming