FANUC Series 16/18/160/180-Model C for Lathe Operator Manual

PROGRAMMING
9. COORDINATE VALUE
AND DIMENSION
B–62754EN/01
104
Since the work cross section is usually circular in CNC lathe control
programming, its dimensions can be specified in two ways :
Diameter and Radius
When the diameter is specified, it is called diameter programming and
when the radius is specified, it is called radius programming.
Z axis
A
B
D
1
X axis
D
2
R
1
R
2
D
1
, D
2
: Diameter programming
R
1
, R
2
: Radius programming
Radius programming or diameter programming can be specified by
parameter DIA (No.1006#3). When using diameter programming, note
the conditions listed in the table9.4(a).
Table 9.4(a) Notes on specifying diameter value
Item Notes
X axis command Specified with a diameter value
Incremental command Specified with a diameter value
In the above figure, specifies D2 minus
D1 for tool path B to A.
Coordinate system setting (G50) Specifies a coordinate value with a diam-
eter value
Component of tool offset value Parameter (No.5004#1) determines either
diameter or radius value
Parameters in canned cycle,
such as cutting depth along X
axis. (R)
Specifies a radius value
Radius designation in circular in-
terpolation (R, I, K, and etc.)
Specifies a radius value
Feedrate along axis Specifies change of radius/rev. or change
of radius/min.
Display of axis position Displayed as diameter value
9.4
DIAMETER AND
RADIUS
PROGRAMMING
Explanations
D Notes on diameter
programming/radius
programming for each
command

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