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2.5.6.3
Cutting
feed accel/decel
(1)
Automatic acceleration and deceleration
of
feed motion
(G01
to
G03)
are
in
the exponential mode.
(2)
Feedrate time
constants
and
feedrate bias
are
set
by
parameters.
During tapping,
time
constants
and bias
other than for normal feedrate
can be
set
by
parameters.
(Pm2501
—
, Pm25 II
—
,
Pm2821-,
Pm2831
-)
l
v
Fi
SPEED
i
TIME
Fig. 2.5.6
Exponential
Accel/decel
Speed
Automatic
acccl decel
parameters
are
set to
the optimum
values for
respective
machines. Do
not
change
the
setting
unless
required
for
special purposes.
2.5.7
Override
For details
on override,
refer
to
command or reference manuals issued
by
your
machine tool builder.
2.5.7.1
Feed rate override
(1)
In the automatic
operation mode
(TAPE,
MEM.
or
MDI),
the
feedrate
instructed
by
the F code
can
be overridden in
21
steps
from
0
to
200
%
in increments
of
10%.
(2)
However,
the feed
by tapping cycle G7
A or
G84 is as instructed by the
F
code,
and
cannot
be
overridden.
(3)
If the OVERRIDE CANCEL switch is ON. the feed is
not
affected
by
this selection switch and runs as instructed
by
the F code.
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63
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