What is an Oval ? ( was Re: Newbie: Machining an oval?

My terminology was poor. I should have said ellipse.

Thanks,

George

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<davemucha@j...> wrote:

> from http://mathworld.wolfram.com/Oval.html
>
> "An oval is a curve resembling a squashed circle but, unlike the
> ellipse, without a precise mathematical definition. "
>
> An oval by deffination is a non-precision shape. The derrivation

of

> the word come from EGG, so an oval is typically more egg shaped.
> Basically egg-shaped and not symetrical in all respects. also, it

a

> very broad term with no really specific shape.
>
> " The word "oval" merely means "egg-shaped"; you are right that it
> comes from the Latin word for "egg". It is not a precisely defined
> mathematical term. If we wanted to make it more precise, we might
> require these features:
>
> continuous, smooth closed curve
> convex ("concave" is a misprint on that site!)
> not an exact circle
> one axis of symmetry
> longer along the axis than across it
>
> -end quote,
> from http://mathforum.org/library/drmath/view/60808.html
>
>
> that would require more than a simple program to define all the
> coordinates.
>
> but if you are referring to an ellipse as an oval, or a specifc

shape

> such as a flat oval, or some of the many many other forms of

rounded

> cornered objects, there would be some way to do the math.
>
> Since this can quickly get way off track, it may be best to define
> the term and the shape needed.
>
> an ellipse is the oval used in older picture frames,

mathelatically

> exact and not too hard to write G-code for.
>
> I guess this question needs to go back for further information.
>
> Dave
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Indy123456"
> <indy123456@y...> wrote:
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "gglines1"

<gglines@c...>

> > wrote:
> > > Can the G02/G03 commands be used to machine an oval tool path?
> >
> > I whipped up a Windows program in IBasic today to generate G-

code

> for
> > a true oval... you input the X center and Y center where you

want

> the
> > oval, input the (long) length you want, click either the "long
> length
> > along X axis" button or "long length along Y axis" button, and

it

> > outputs code like this...
> >
> > G90
> > G00 X0.1250 Y4.1854 Z1.0000 ( CAUTION - ARBITRARY Z )
> > G01 Z-.8 F2 ( CAUTION - ARBITRARY Z and Feed )
> > G02 X0.1250 Y9.8146 R3.2500
> > G02 X9.8750 Y9.8146 R9.7500
> > G02 X9.8750 Y4.1854 R3.2500
> > G02 X0.1250 Y4.1854 R9.7500
> >
> > You can get it at:
> >
> > www.woodsucker.com/goval.htm
> >
> > Comments appreciated.