Siemens SINUMERIK 840D sl Function Manual page 1766

Detailed description
2.3 Feedrate control
Interface signals
Figure 2-7
2.3.8 Feedrate for chamfer/rounding FRC, FRCM
General
The machining conditions can change significantly during surface transitions to
chamfer/rounding. The chamfer/rounding contour elements therefore need their own
optimized feedrate values in order to achieve the required surface finish.
Function
You can program the feedrate for the chamfer/rounding with FRC (non-modal) or FRCM
(modal).
The feedrate value is interpreted according to the type of feedrate active:
G94, G961, G971:
G95, G96, G97:
The FRC/FRCM value is applied depending upon the machine data:
MD20201 CHFRND_MODE_MASK
Bit 0 = 0:
Bit 1 = 0:
Reason: The feedrate type (G94,G95,G96,G961 etc.) and thus the conversion to the
internal format must be consistent within the block for F and FRC/FRCM.
50
Overview of interface signals for fixed feedrate
Feedrate in mm/min, inch/min or
Revolutional feedrate in mm/rev or inch/rev
FRC/FRCM from following block (default setting)
FRC/FRCM from preceding block (recommended setting)
/min
o
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0