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16 Automatic Geometric Calculations
128
Fig. 16.3.2-3 Fig. 16.3.2-4
Let us see the following example:
%O9981
N10 G17 G42 G0 X100 Y20 D0 S200 M3
N20 G1 X-30 Y-20
N30 G3 X20 Y40 I20 J-10 R50 Q-1
N40 G40 G0 Y60
N50 X120
N60 M30
%
%O9982
N10 G17 G42 G0 X100 Y20 D0 S200 M3
N20 G1 X-30 Y-20
N30 G3 X20 Y40 I20 J-10 R50 Q1
N40 G40 G0 Y60
N50 X120
N60 M30
%
Circular block N30 G3 is determined over, for both the center coordinates (I20 J–10 in absolute
value) and the circle radius (R50) are specified, the control calculates the intersection of the straight
line given in block N20 and the circle given in block N30. In program O9981 the nearer intersection
in direction of the straight line is calculated because Q–1 is given in circular block N30.
Linear-circular intersection calculation can also be combined with chamfering or rounding
specification. E.g.:
%O9983
N10 G17 G42 G0 X100 Y20 D0 S200 M3
N20 G1 X-30 Y-20 ,R15
N30 G3 X20 Y40 I20 J-10 R50 Q-1
N40 G40 G0 Y60
N50 X120
N60 M30
%
The control calculates the intersection of blocks N20 and N30 and inserts a 15mm corner rounding
as the effect of ,R15 given in block N20.