2.4. 2.1 Feed Per Revolution (G 99 Mode)
(1) Tool feed per revolution of the spindle can
be specified with F (normal feed) or E ( fine
feed) .
(2) The feed ranges that can be specified by
the F and E codes are as follows.
G 99
Mode, F and E Feed Ranges
Range
of Feed/Revel ution
Metric
F 32
F 0.01- F 500.00 mm/rev
input
Metric
E34
~
E 0.0001- E 500.0000 mmlrev
output
Inch I
F 24
I
F 0.0301 –F19.6Ek50 in./rev
input
I
E 26
1
E0.000004–E 19.685000
in./rev
Metric
F 32
F 0,01 –F1270.00 mmlrev
, input
Inch
E34
E 0.0003-E 1270.0000 mmlrev
output
Inch
F 24
FO.001 –F 50.0000 in./rev
input
E 26 F O.000010-E 50.00C0OO in/rev
These feed ranges are subject to the following
restrictions depending on the spindle speed S.
Metric output
I F(E) XS~24,000mm/min
Inch output
I
F(E)XS S 2,400 in./min
Notes :
1. Program feed per revolution within such a range that the
X-axis component remains below 12,000 mm/min or
1,200 in./min.
2. This uppar limit may still be reduced by the performance
limit of the machine.
Refer to the machine tool builder’s manual.
Notes :
1.
2.
3.
A command “FO” causes data errors.
Any minus value should not be specified for
F commands.
If specified,
the machine will
not operate properly.
EXAMPLE
F-250 ; . . . . . Wrong
Feedrate commands in the direction of the
X–axis must be given in radius.
EXAMPLE
G99 S350 (r/rein) ;
GO1 U1OO. F200 ;
. . . In case of F32.
In the above case, the feedrate is:
F x S = 2.0 mm/rev. x 35o r/rein
= 700 mm/m~n
+x
ql
I
FEEDRATE
700 mm/mn
4.
Values of F command at linear or circular in–
terpolation represent the tangential feedrate
when two axes are simultaneously controlled.
EXAMPLE 1
G99 S1OOO (r/rein) ;
GO1 U60, W40. F50 ;
In the above case, the feedrate is
F
x S = 0, 5 mm/reV x Io(lf) r/rein
=
500 mm/min
~3002 + 4002
rr
I
Lz-axis feedrate component
I
‘X–axis feedrate component
+x
I
~.o
x
#+
@~
TANGENTIAL
FEEDFIATE
~ 300 mm/mln
——-
400 mm/mln
IO’
~ .Z
EXAMPLE 2
G99 s1OOO (r/rein) ;
G03 U.. - W.. . I
In the above case,
FxS= 0.2
(mm/rev)
(a)
. . F20 ;
the feedrate is:
x
1000
(r/rein)
= 200 mm/min
. 4fx2 + fz2
CENTER
+x
t
fx
L---- .Z
(b)
11
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