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

Thanks Kim!! I'll be looking forward to your solution!! That
should translate into Excel very nicely. Excel seems to be a good
aid for G coding since it's 3D too. Charles

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Kim Lux <lux@d...> wrote:
> 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
> > >
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> >
> > Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> > Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> > List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
wanliker@a..., timg@k...
> > Moderator: pentam@c... indigo_red@q... [Moderators]
> > URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> >
> > OFF Topic POSTS: General Machining
> > If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to
reach it if you have trouble.
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this
to be a sister site to the CCED group, as many of the same members
are there, for OT subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO
EXCEPTIONS........
> > bill
> > List Mom
> > List Owner
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> --
> Kim Lux <lux@d...>