
B-63782EN/01 NC FUNCTIONS 5.FEED FUNCTION
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5.2.7 Setting Input of Cutting Feedrate
With some machines, the cutting feedrate need not be changed frequently
during machining. For such machines, a cutting feedrate (a non-zero
value) can be set in parameter. With this function, the cutting feedrate (F
code) need not be specified in the NC command data.
5.2.8 Feedrate Specification on a Virtual Circle for a Rotary Axis
The method of feedrate specification on a machine with a rotation axis is
improved.
[Conventional method]
Sample program:
N1G91G01X10.F100.
N2C10.F50
The feedrate of the rotation
axis is specified using the
speed of the rotation axis.
Specified
feedrate
(deg/min)
Y
N2
N1
C
[Method of feedrate specification on a virtual circle for a rotation axis]
Specified
feedrate
(mm/min)
Virtual
circle
radius
Y
Sample program:
N1G91G01X10.F100.
N2C10.
The travel feedrate on the
virtual circle of a radius
specified by a parameter is
the specified feedrate.
By setting a virtual radius of 0,
the rotation axis can be
excluded from feedrate
calculation.
N2
N1
C
NOTE
By using this function, the travel feedrate on a virtual
circle becomes the specified feedrate. In general,
however, the feedrate at a cutting point does not
become a specified feedrate.