Chamfer, Rounding (Chf, Chr, Rnd, Rndm, Frc, Frcm) - Siemens SINUMERIK 828D Programming Manual

Motion commands

9.15 Chamfer, rounding (CHF, CHR, RND, RNDM, FRC, FRCM)

9.15 Chamfer, rounding (CHF, CHR, RND, RNDM, FRC, FRCM)
Function
Contour corners within the active working plane can be executed as roundings or chamfers.
For optimum surface quality, a separate feedrate can be programmed for chamfering/
rounding. If a feedrate is not programmed, the standard path feedrate F will be applied.
The "Modal rounding" function can be used to round multiple contour corners in the same
way one after the other.
Syntax
Chamfer the contour corner:
G... X... Z... CHR/CHF=<value> FRC/FRCM=<value>
G... X... Z...
Round the contour corner:
G... X... Z... RND=<value> FRC=<value>
G... X... Z...
Modal rounding:
G... X... Z... RNDM=<value> FRCM=<value>
...
RNDM=0
Note
The technology (feedrate, feedrate type, M commands, etc.) for chamfering/rounding is
derived from either the previous or the next block dependent on the setting of bit 0 in
machine data MD20201 $MC_CHFRND_MODE_MASK (chamfer/rounding behavior). The
recommended setting is the derivation from the previous block (bit 0 = 1).
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Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals