
B–63522EN/02
21. AXES CONTROL
NC FUNCTION
295
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.
Time
R point
Upper dead point
Lower dead point
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
21.17
CHOPPING
FUNCTION
(G80, G81.1)
M series
Explanations
Format