ACU-RITE CNC 3500i - Manual (Page 434)

408 11 G-Code Edit, Help, & Advanced Features
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The read only variables are set in Blocks N60 to N90. Then, the
sub-program is called. At Block N170, the first move is made along the
X-axis, followed by a move along the Y-axis. At Blocks N190 and N200,
the logical negative sign makes the axis move in the opposite
direction. The contents of the variables remain the same.
At Block N220, a loop, which ends at Block N310, is set up. The loop
runs the number of times contained in variable #154. The first move in
the loop is in the X and Y axes to the side of cut value in #153. In Block
N240, #111 decrements at each pass through the loop, by the value
of the side cut. This value, in turn, is used to calculate a new length of
cut for each side.
N210 #111 = 0 ;* SET SIDE CUT INCREMENT TO 0
N220 LOOP #154 ;* LOOP #154 NUMBER OF TIMES
N230 X#153 Y#153 ;* SET SIDE CUT
N240 #111 = #111 #153 ;* DECREMENT SIDE CUT EACH
LOOP
N250 #101 = #151 + (#111 * 2 ) ;* CALCULATE NEW X
LENGTH
N260 #102 = #152 + (#111 * 2 ) ;* CALCULATE NEW Y
LENGTH
N270 X#101 ;* MOVE AROUND SQUARE USING NEW SIDE
* LENGTHS
N280 Y#102
N290 X( #101)
N300 Y( #102)
N310 END
N320 M99