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

B-63324EN/03 PROGRAMMING 19.AXIS CONTROL FUNCTIONS
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19.5 CHOPPING FUNCTION (G80,G81.1)
When contour grinding is performed, the chopping function can be used
to grind the side face of a workpiece. By means of this function, while
the grinding axis (the axis with the grinding wheel) is being moved
vertically, a contour program can be executed to instigate movement
along other axes.
The chopping function can be executed with a program command or by
setting the switches on the machine operator’s panel. For an
explanation of chopping with the switch on the machine operator’s
panel, refer to the manual provided by the machine tool builder.
Format
G81.1 Z_Q_R_F_;
Z : Upper dead point
(When the axis for grinding is other than the Z-axis, specify
the axis
address.)
Q : Distance between the upper dead point and lower dead
point
(Specify the distance as an incremental value, relative to
the upper
dead point.)
R : Distance from the upper dead point to point R
(Specify the distance as an incremental value, relative to
the upper
dead point.)
F : Feedrate during chopping
The unit for the Q and R commands is equal to the increment
system of the grinding axis.
The F command must be specified without the decimal point.
G80 ; Cancels chopping
Explanation
- Basic operation
Chopping follows the steps described below:
(1) The tool is positioned at point R at the rapid traverse feedrate.
(2) The tool is moved to the bottom dead center at the feedrate
specified by F.
(3) The tool is returned to the top dead center at the feedrate specified
by F.
(4) The tool travels between the top dead center and bottom dead
center at the chopping feedrate specified by F. The chopping
feedrate can be overridden by pressing a switch on the machine
operator’s panel.

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