NCT Group 99M, 2000M manual Let us see the following example

16 Automatic Geometric Calculations

Let us see the following example:

Fig. 16.3.4-3

Fig. 16.3.4-4

%O9985						%O9986
N10	G17	G54		G0 X200 Y10 M3 S200		N10	G17	G54		G0 X200 Y10 M3 S200
N20	G42	G1	X180		D1	N20	G42	G1	X180		D1
N30	G3 X130			Y-40 R-50		N30	G3 X130			Y-40 R-50
N40	X90	Y87.446			I50 J30 R70 Q–1	N40	X90	Y87.446			I50 J30 R70 Q1
N50	G40	G0	Y100			N50	G40	G0	Y100
N60	X200					N60	X200
N70	M30					N70	M30
%						%

Circular block N40 is defined over because both, the center coordinates (I50 J30 in absolute value) and the radius (R70) of the circle, are specified. Therefore coordinates X130 Y–40 of the circle programmed in the previous block N30, are not referred to as end point coordinates, but only as a point which is lying on the circle and the end point is the calculated intersection. In program No. O9985 the nearer intersection in clockwise direction is given (Q–1), while in O9986 the farther one is specified (Q1).

Circle intersection calculation can also be combined with chamfer or corner rounding specification. E.g.:

%O9986

N10 G17 G54 G0 X200 Y10 M3 S200

N20 G42 G1 X180 D1

N30 G3 X130 Y-40 R-50 ,R20

N40 X90 Y87.446 I50 J30 R70 Q1

N50 G40 G0 Y100

N60 X200

N70 M30

%

In the example a 20mm corner-rounding is programmed in block N30 (,R20). The control calculates the intersection of blocks N30 and N40 and inserts the programmed rounding to the resulting contour.

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