Fanuc Series 15i/150i-MA (Programming) Operators Manual

8.COORDINATE VALUE AND DIMENSION PROGRAMMING B-63324EN/03
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8.5 DIAMETER AND RADIUS PROGRAMMING
Since the section of a workpiece to be machined in a lathe is usually
circular, the sectional dimensions can be programmed with diameters
or radiuses in an NC unit.
D
1
D
2
R
1
R
2
A
B
D
1
, D
2
: Diameter programming
R
1
, R
2
: Radius programming
X-axis
Z-axis
Specifying the dimensions of a workpiece using diameters is called
diameter programming. Specifying the dimensions using radiuses is
called radius programming. DIA(bit3) of parameter 1006 is used to
specify whether the dimensions for each axis are specified using
diameters or radiuses.
Conform to the conditions in the table below when specifying the
dimensions of a workpiece using diameters for the X-axis.
Item Notes
Commands for the Z-axis Irrespective of diameters and radiuses.
Commands for the X-axis Use diameters.
Incremental commands for the X-
axis
Use diameters.
B A in the above figure: D2D1
Coordinate system specification
(G92)
Specify the X coordinates using
diameters.
Radius commands (R, I, J, K) for
circular interpolation
Use radiuses.
Feedrate along the X-axis Radius change/rev
Radius change/min
Displaying X coordinates Use diameters
CAUTION
The following does not describe the details of
diameter and radius programming. In short, the
gradations for the X-axis are defined in diameters
during diameter programming, and defined in
radiuses during radius programming.

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