FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

PROGRAMMING
21. AXIS CONTROL FUNCTIONS
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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.
In addition, a servo delay compensation function is supported for
chopping operations. When the grinding axis is moved vertically at high
speed, a servo delay and acceleration/deceleration delay occur. These
delays prevent the tool from actually reaching the specified position. The
servo delay compensation function compensates for any displacement by
increasing the feedrate. Thus, grinding can be performed almost up to the
specified position.
There are two types of chopping functions: that specified by
programming, and that activated by signal input. For details of the
chopping function activated by signal input, refer to the manual provided
by the machine tool builder.
G81.1 Z__ Q__ R__ F__ ;
Z : Upper dead point
(For an axis 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
G80; Cancels chopping
Before chopping can be started, the chopping axis, reference position,
upper dead point, lower dead point, and chopping feedrate must be set
using the parameter screen (or the chopping screen).
For details, refer to the manual provided by the machine tool builder.
From the start of chopping to point R, the tool moves at the rapid traverse
rate (specified by parameter No. 1420).
The override function can be used for either the normal rapid traverserate
or chopping feedrate, one of which can be selected by setting CPRPD (bit
0 of parameter No. 8360).
When the chopping feedrate is overridden, settings between 110% and
150% are clamped to 100%.
Between point R, reached after the start of chopping, and the point where
the chopping is canceled, the tool moves at the chopping feedrate
(specified by parameter No. 8374).
21.6
CHOPPING
FUNCTION
(G80, G81.1)
Format
Explanations
D Chopping activated by
signal input
D Chopping feedrate
(feedrate of movement to
point R)
D Chopping feedrate
(feedrate of movement
from point R)

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