Re: equation for locating the center of an arc knowing three points

Hey Fred, Alan,

Thanks, but those ideas about as fast as mine. I am really more
interested in the equation to locate the center so I can finish
generating the arrays in Excel.

Charles

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Fred Smith" <imserv@v...>
wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Alan Marconett KM6VV
> <KM6VV@a...> wrote:
> > Hi Charles,
> >
> > I thought about recommending the Vector CAD (and probably

others)

> can
> > find the center of an arc, or, as I did on a recent DXF import

from

> a
> > Schematic capture program, edit on of the little arcs, and make

it

> a
> > full circle (delete all the other fragments). Trouble is, I

think

> he
> > has just short LINES, not ARCS. So it isn't as easy!
>
> The Vector, Arc-Spline function could be used. It fits arcs to

cubic

> splines or Nurbs curves and it has an arc-chordal error tolerance

so

> that an appropriate level of accuracy can be maintained in the
> process. Most likely his software has something similar, just

hard

> to find it. ;-)
>
> Best Regards, Fred Smith- IMService
>
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