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

B-63324EN/03 PROGRAMMING 13.FUNCTIONS TO SIMPLIFY PROGRAMMING
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13.8 NORMAL DIRECTION CONTROL (G40.1, G41.1, G42.1)
When a tool with a rotation axis (C-axis) is moved in the XY plane
during cutting, the normal direction control function can control the
tool so that the C-axis is always perpendicular to the tool path (Fig.
14.11 (a)).
Between blocks in normal direction control mode, movement on the
C-axis is inserted so that, as the move direction changes, the tool is
positioned perpendicular to the move direction at the start point of each
block.
Fig.13.8 (a) Sample Movement of the tool
Format
G code Function Explanation
G41.1
Normal direction control left
G42.1
Normal direction control right
G40.1
Normal direction control cancel
If the workpiece is to the right of the tool path
looking toward the direction in which the tool
advances, the normal direction control left
(G41.1) function is specified.
After G41.1 or G42.1 is specified, the normal
direction control function is enabled (normal
direction control mode).
When G40.1 is specified, the normal
direction control mode is canceled.
Tool
Tool
C-axis
C-axis
Programmed tool path
Normal direction
(in which the tool moves)

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