Re: Math for constant speed ellipse

> If you hold the speed constant along the _inside_ edge of the path,

then the

> speed along the _outside_ edge of the path will be faster when

going around

> a curve, compared with going straight.
>

Step + Direction based CNC Controller translate all
driving instructions before motion, they are based on
the cutter center line.
Directly supported moves are circular and linear only.

Indirectly all circular moves are elliptical in nature
because of the possible different resolutions or effects
of scaling on individual axeses.

Speeds are computed based on this resolution for the dominant
drive axes in effect.
The acuracy is corsely anglined to the grit pattern and is never
precise specially on controllers that allow for a 3rd axes departure
concurrently.

Elliptical shapes are converted by the CAM Processor.
Usually it is broken down into linear moves or on better
ones into arcs then posted as G-Code.

Good Luck