
5. FEED FUNCTIONS
(Note)
When the rotation speed of the position coder is 1 rpm or less, the feed rate becomes nonuniform.
ln cases where machining is not adversely affected by feed rate nonuniformity, the position coder can be used
at 1 rpm or less.
Though the degree of nonuniformity differs according to the case, the degree becomes large as the rotation
speed becomes low under 1 rpm. Format of G94 and G95 is shown in Table 5.2.3.
Meaning
Address
G code
Override
Clamp
Value
Table 5.4 Format of G94 and G95
I
Feed per minute
Feed per revolution
Tool feed amount per minute
Tool feed amount per revolution
F
F
G94 G95
G94 and G95 Overrides can be applied.
The feed rate is clamped at the maximum feedrate.
The clamp value is set by the machine tool builder.
(The feedrate with an override applied is clamped.)
5.5 Rate Feed (G93)
Specify the rate feed mode by G93,
numeric value following F. Taking
speed, accelerate or decelerate at a
mm/min or inch/min. Once G93 is
and specify the tool’s final velocity directly by the
the value of F of the preceding block as initial
certain ratio. Specify the unit of the value of F by
specified modal, it is valid unit1 G94 (per minute
feed) or G95 (per revolution dwell) is specified.
F f2
fO 5,
.
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.
.
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:
.
.
:
:
.
i xl i x2 ; x3 ;
:
.
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:
:
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:
.
t
NlO
GO1
G93 FfO ;
N20
x xl Ffl ;
N30
x x2
Ff2 ;
N40
x x3
Ff3 ;
(Note 1) You can not specw 0 for F.
(Note 2) The upper limit of acceleration speed is clamped by the parameter FEDMX (No. 1422) for the upper
limit of normal cutting feed.
(Note 3) Set the lower limit of deceleration speed by a parameter RFDMN (No. 1480). When nothing is set,
1000 is assumed. The unit is 0.001 mm/min or 0.00001 inch/min in the input unit system.
l-19