Siemens SINUMERIK 828D Programming Manual page 284

Motion commands
9.15 Chamfer, rounding (CHF, CHR, RND, RNDM, FRC, FRCM)
Note
FRC/FRCM
FRC/FRCM has no effect if a chamfer is traversed with G0; the command can be
programmed according to the F value without error message.
FRC is only effective if a chamfer/rounding is programmed in the block or if RNDM has been
activated.
FRC overwrites the F or FRCM value in the current block.
The feedrate programmed under FRC must be greater than zero.
FRCM=0 activates the feedrate programmed under F for chamfering/rounding.
If FRCM is programmed, the FRCM value will need to be reprogrammed like F on change
G94 ↔ G95, etc. If only F is reprogrammed and if the feedrate type FRCM > 0 before the
change, an error message will be output.
Examples
Example 1: Chamfering between two straight lines
284
• 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 chamfering 100 mm/min.
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals