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2.13
PROGRAM SUPPORT FUNCTIONS (Cont'd)
(2)
Parameters
Preset override
rates at
the
first and second
steps:
Pm2120...Fl:
Percentage
of
overriding
of
first-step F
feedrate
(1
to
100)
Pm2121...F2: Percentage
of overriding of second-step F
feedrate
(1
to
100)
h
the cutting margin is
greater
than the tool
diameter, Pm2l20 is fixed
to
100%.
(3)
Operation
This function
automatically
calculates the position where load
to
the
tool increases
inside
a
corner
from the tool diameter and the
cutting
margin.
Load is
applied
to
different
points depending
on
the tool diameter
and the cutting margin.
There
are the following three cases:
<D
Tool diameter
is
not
greater
than
1/2
of
cutting margin
(D
1/2)
®
Tool
diameter is
greater
than
cutting margin
{D
>
I)
<3>
Tool
diameter
is
not
greater
than
cutting margin and
is
greater
than
1/2
of
cutting margin (1/2
<
D
I)
In the above
cases,
cutting speed
is determined differently as follows:
(J'I
Tool diameter
is
not greater
than
1/2
of
cutting margin.
No
corner override is applied regardless of the
parameter
value.
Cutting
is
performed
at
uniform
speed set by
F0.
Cutting margin
I'
i
t
1
l
i
i
Fig. 2.13.34 Tool diameter is not
greater
than
1/2
of cutting margin.
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226
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