
B-63942EN/02 NC FUNCTION 1.CONTROLLED AXIS
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1.22 CHOPPING FUNCTION
M
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 initiate
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.
Point R
Upper dead point
Lower dead point
Time
Format
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