Siemens SINUMERIK 840D sl Programming Manual page 146

Feed control
7.9 Feedrate optimization for curved path sections (CFTCP, CFC, CFIN)
Significance
CFTCP:
CFC:
CFIN:
Example
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
146
Constant feedrate on the milling cutter center path
The control keeps the feedrate constant and feedrate offsets 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.
In this example, the contour is first produced
with 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 a
feedrate that is too high.
Comment
; Feed to first cutting depth
; Subroutine call
; Feed to second cutting depth
; Subroutine call
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals