
1.AXIS CONTROL B-63783EN-1/01
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1.11 CHOPPING FUNCTION
General
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.
Format
G81.1 Z_Q_R_F_;
Z : Upper dead point
(When the axis for drinding 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 units of the Q and R commands are the same
as for the increment system of the grinding axis.
Specify the F command without using a decimal
point.
G80 ; Cancels chopping
Explanation
- Basic operation
Chopping operation is performed as follows:
(1) Movement is made by rapid traverse for positioning to point R.
(2) Movement is made to the lower dead point at the rapid traverse
rate specified in F.
(3) A return is made to the upper dead point at the feedrate specified
in F.
(4) Then, back and forth movement is made repeatedly between the
upper dead point and lower dead point at the chopping feedrate
specified in F. The switch on the machine operator's panel can be
used to override the chopping feedrate.
Chopping continues even when the mode is switched to the manual
mode, or when automatic operation is stopped by the application of
feed hold. Chopping is stopped by specifying a G80 command or by a
reset, after which a return is made to point R. Chopping is stopped
immediately if an emergency stop is applied or if a servo alarm is
issued.