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

I was not able to find this in the Machinery Handbook, but I used a
Linux math package to solve the equations and have them somewhere. I'll
post it next week.

On Fri, 2003-06-27 at 17:21, Alan Marconett KM6VV wrote:
> Hi Charles,
>
> Sorry! Thought you wanted a CAD solution! For an algorithm, you need
> to create two cords (less then dia) to the circle, then erect
> perpendiculars to the two cords. the intersection of the two lines is
> the center. I think Machinery's Handbook has examples.
>
> Alan KM6VV
>
>
> Charles Hixon wrote:
> >
> > 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
> > >
> > > Listserve Special discounts and offers are at:
> > > http://www.imsrv.com/hobby
> > >
> > > We are THE source for low cost Cad Cam
> >
>
>
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