Re: Filter or converter for converting short lines to arcs

Thanks Ray! That actually makes sense! Since I'm generating my
Gcode values in Excel, I'm programming the values, calculation and
results right where they need to be. Charles

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Raymond Heckert" <jnr@a...>
wrote:

> Actually, it's a string of equations. First, you make line

segments from

> (X1,Y1) minus (X2,Y2), then, another line segment from (X3,Y3)

minus

> (X2,Y2). Then find the centerpoints of each line segment (as in

(X1+X2)/2,

> and (Y1+Y2)/2). Then convert segments into the slope intercept, or

y = mx +

> b form, then construct the perpendicular bisectors to each line

(where the

> 'new' slopes are 1/m, in each case), and where the perpendiculars

cross

> (i.e. the equations of the line segments are equal in value) is the
> centerpoint of the circle. Much more complex explaining it than

actually

> doing it. Even easier with a computer that's running some form of

BASIC

> language.
>
> RayHex
>
> ----------
> > From: Charles Hixon <cehixon@y...>
> >
> > What is the equation to determine the center of an arc given

three

> > points on the arc? charles
> >