Siemens Sinumerik 840D sl Programming Manual page 242

Motion commands
10.12 Chamfer, rounding (CHF, CHR, RND, RNDM, FRC, FRCM)
Examples
Example 1: Chamfer between two straight lines
Programming can be performed in two ways:
● Programming with CHR
Program code
...
N30 G1 Z... CHR=2 FRC=100
N40 G1 X...
...
● Programming with CHF
Program code
...
N30 G1 Z... CHF=2(cosα*2) FRC=100
N40 G1 X...
...
242
● MD20201 Bit 0 = 1 (derived from previous
block).
● G71 is active.
● The width of the chamfer in the direction of
motion (CHR) should be 2 mm and the
feedrate for chamfer 100 mm/min.
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals