# FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

PROGRAMMING
5. FEED FUNCTIONS
B–62764EN/01
86
When G93 is specified, the inverse time specification mode (G93 mode)
is set. Specify the inverse time (FRN) with an F code.
A value from 0.001 to 9999.999 can be specified as FRN, regardless of
whether the input mode is inches or metric, or the increment system is
IS–B or IS–C.
F code specification value FRN
F1 0.001
F1
*1
1.000
F1.0 1.000
F9999999 9999.999
F9999
*1
9999.000
F9999.999 9999.999
NOTE
*1
Value specified in fixed–point format with bit 0 (DPI) of parameter
No. 3401 set to 1
For linear interpolation (G01)
feedrate
distance
FRN=
1
time (min)
=
Feedrate:mm/min (for metric input)
inch/min(for inch input)
Distance:mm (for metric input)
inch(for inch input)
- To end a block in 1 (min)
FRN =
1
=
1
1 (min)
= 1
time (min)
Specify F1.0.
- To end a block in 10 (sec)
FRN =
1
time (sec) / 60
=
1
10/60 (sec)
= 6 Specify F6.0.
- To find the movement time required when F0.5 is specified
1
FRN
=
1
0.5
= 2
Time (min) =
2 (min) is required.
- To find the movement time required when F10.0 is specified
Time (sec) =
160
FRN
=
60
10
= 6
6 (sec) is required.
For circular interpolation (G01)
FRN=
1
=
time (min)
feedrate
Feedrate: mm/min (for metric input)
inch/min(for inch input)
Arc radius: mm (for metric input)
inch(for inch input)
NOTE
In the case of circular interpolation, the feedrate is
calculated notfrom the actual amount of movement in the