Siemens SINUMERIK 840D sl Programming Manual

Meaning
CFTCP: Constant feedrate on the milling cutter center path
The control keeps the feedrate constant and feedrate overrides are deactivated.
CFC: Constant feedrate at the contour (tool cutting edge).
This function is preset per default.
CFIN: 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.
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.
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Program code Comment
N10 G17 G54 G64 T1 M6
N20 S3000 M3 CFC F500 G41
N30 G0 X-10
N40 Y0 Z-10 ; Feed to first cutting depth
N50 CONTOUR1 ; Subprogram call
N40 CFIN Z-25 ; Feed to second cutting depth
N50 CONTOUR1 ; Subprogram call
N60 Y120
N70 X200 M30
Fundamentals
2.7 Feed control
NC programming
132 Programming Manual, 12/2019, 6FC5398-2EP40-0BA0

Siemens SINUMERIK 840D sl Specifications

General

Control Type	CNC
Number of Axes	Up to 31
Max Number of Channels	10
Interfaces	Ethernet, PROFIBUS, PROFINET, USB
Interpolation	5-axis interpolation
Operating Temperature	0°C to 45°C
Relative Humidity	Up to 95% (non-condensing)
Display	TFT color display, various sizes
Programming Languages	DIN/ISO
Safety Features	Safety Integrated
PLC	Integrated PLC S7-300
Drive Interface	SINAMICS S120
Data Storage	CF card, USB
Operating System	Windows-based