Siemens SINUMERIK 840DE

Programming Motion Commands
4.22 Chamfer, rounding (CHF, CHR, RND, RNDM, FRC, FRCM)
Fundamentals
4-72 Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
If FRC/FRCM is not programmed, then the normal path feedrate F is applicable.
Programming
CHF=…
Or
CHR=…
Or
RND=…
Or
RNDM=…
Or
FRC=…
Or
FRCM=…
Parameters
CHF=… Chamfer the contour corner
Value = Length of the chamfer (unit of measurement according to
G70/G71)
CHR=… Chamfer the contour corner
Programming the chamfer in the original direction of movement.
Value = width of chamfer in direction of motion (unit of
measurement as above)
RND=… Round the contour corner
Value = Radius of the rounding (unit of measurement according
to G70/G71)
RNDM=… Modal rounding: Rounding several consecutive contour corners in
the same way.
Value = Radius of the roundings (unit of measurement according
to G70/G71)
Rounding is deactivated with RNDM=0.
FRC=… Non-modal feedrate for chamfer/rounding
Value = feedrate in mm/min (G94) or mm/rev (G95); FRC > 0
FRCM=… Modal feedrate for chamfer/rounding
Value = feedrate in mm/min (G94) or mm/rev (G95)
=0: The feedrate programmed under F for the chamfer/rounding is
active.
Feed FRC (non-modal), FRCM (modal)
To optimize surface quality, it is possible to program a separate feedrate for the
chamfer/rounding contour elements. FRC is non-modal and FRCM is modal, see examples.