Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual page 94

FRCM=...
Information
The chamfer/rounding functions are executed in the current planes G18 to G19.
The appropriate instruction CHF= ... or CHR=... or RND=... or RNDM=... is written in the block with axis movements leading
to the corner.
The programmed value for chamfer and rounding is automatically reduced if the contour length of an involved block is
insufficient.
No chamfer/rounding is inserted, if
● more than three blocks in the connection are programmed that do not contain any information for traversing in the plane,
● or a plane change is carried out.
F, FRC,FRCM are not active when a chamfer is traversed with G0.
If the feedrate F is active for chamfer/rounding, it is by default the value from the block which leads away from the corner.
Other settings can be configured via machine data.
Chamfer CHF or CHR
A linear contour element is inserted between linear and circle contours in any combination. The edge is broken.
See the following illustration for inserting a chamfer with CHF using the example: between two straight lines.
94
; Modal feedrate for chamfer/rounding:
Value >0: Feedrate in mm/min (G94) or mm/rev. (G95),
Modal feedrate for chamfer/rounding ON
Value = 0: Modal feedrate for chamfer/rounding OFF
Feedrate F applies to the chamfer/rounding.
Programming and Operating Manual (Turning)
6FC5398-5DP10-0BA2, 06/2015