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

B-63324EN/03 PROGRAMMING 13.FUNCTIONS TO SIMPLIFY PROGRAMMING
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for rotation of the tool and a command for movement along the X- and
Y-axes. A single-block stop always occurs after the tool is moved
along the X- and Y-axes.
Fig.13.8 (e) Point at which a Single-Block Stop Occurs in the Normal
Direction Control Mode
Before circular interpolation is started, the C-axis is rotated so that the
C-axis becomes normal to the arc at the start point. During circular
interpolation, the tool is controlled so that the C-axis is always
perpendicular to the tool path determined by circular interpolation.
Fig.13.8 (f) Normal direction control of the circular interpolation
NOTE
During normal direction control, the C axis always
rotates through an angle less than 180 deg. I.e., it
rotates in whichever direction provides the shorter
route.
S
N1
N2
S
N3
S
Programmed path
S : Single block stop point
Cutter center path
The tool is controlled so
that the C-axis is always
normal to the tool path
determined by circular
interpolation.
A rotation command is inserted
so that the C-axis becomes
normal to the arc at the start
point.
Center of the arc
Programmed path
Tool center path

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