Re: G02 - G03

Hi Art,

On hearing your questions on G02, G03, I looked up my code, and I
implemented them with X,Y,I,J. You'll probably have to do the arcs in
four (4) quadrants, and I seem to recall that some controllers don't
like full circles either. My choice came from the first sample code
that I could generate from BobCad, and that FlashCut could understand!
I also found tutorials that supported (explained) this mode.

N110 G03 X 3.7500 Y 2.5000 I-0.2500 J 0.0000

for(angle = StartAngle; angle >= EndAngle; angle -= step)
{
d_cux = 0.0;
d_cuy = -radius; /* 0 deg vector */
RotatePoint(&d_cux, &d_cuy, angle);
_lineto((int)(d_cux + CenterX), (int)(d_cuy + CenterY));
}

I also calculated CenterX, CenterY, radius, StartAngle, and EndAngle as
part of the routine. I rotate through start-end angle, and calculate a
series of points using the radius. These I draw line segments between.
OK, I'm not driving stepper motors yet, I'm just drawing the segments on
the screen as I would if I was driving motors. Intention is to do
coordinated moves with a set of Cybernetic Microsystems IC's.

Alan


Art Fenerty wrote:

>
> Hi:
>
> I am trying to update MasterControlCNC to do G02
> and G03 circular interpolation and although I now have working code ( thanks
> to Doug Fortune) I don't quite understand which is the most common form of
> interp.
> My post processor on the software I use the most does
> not generate circ. only linear. Am I better off using R registers or IJK
> interp? or both? Is IJK now pretty much obsolete?
>
> Art
>
>
>
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