Re: arc or curve fitting program

Karl,
Calculus, Hmmm.....I think you can get an ointment to cure that
nowadays.
The Dolphin Cad system has a curve fit routine. Plot your series of
points, giving either X/Y coordinates, or lengths (radius) and angle.
Select curve fit, pick the points and the system 'fits' the curve(s).
This can then be machined in Dolphin Partmaster, or you can dimension
the end points and radius value(s) of the fitted curve.

If you want to try the calculus route........good luck. If its a one
off requirement, e-mail me off list with the relevant info and I'll
curve fit the points for you. dave_pearson AT btinternet.com

You can find the Dolphin website at www.dolphin-systems.co.uk

HTH

Dave Pearson

--- In CAD_CAM_EDM_DRO@y..., "karl_l_townsend" <karl@c...> wrote:
> I'm taking some careful measurements on a part I'm reverse
> engineering.
>
> Given three, or more, points on a curve. How do I calculate the
best
> G02/G03 parameters to cut that curve? I'm hoping for a simple
windows
> app. that lets you put in points and gives the center and radius of
> the circle fitting those points the best. Also, I'll need to be
able
> to calculate x,y points on that curve (you need endpoints in G02
and
> I'll not be able to measure right at the endpoint). Is the formula
> r**2 = (y - a)**2 + (x - b)**2 ?
>
> I remember covering this in calculus class 30 years ago, but the
only
> reason I got through calculus was due to a very smart girl that let
> me sit right next to her, very near her paper, during quizes.
> Fortunately my eyes had great distance vision at that time <G>
>
>
> Karl