Re: [CAD_CAM_EDM_DRO] 3-D G-CODE convertion

Alan Marconett KM6VV wrote:

> Hi Shabbir,
>
> >From what I understand, anything but a "perfect" arc or circle MUST be
> done as a series of line fragments. So G02 and G03 are out. Not until
> they add a new Gcode for B-splines!

Not necessarily. Some CAM software uses the appropriate G02 or G03
arc command, and figures out the longest arc sector that can be done
without exceeding some error bound. It then codes an arc sector using
a radius that will give the least error. So, any ellipse, or even spline
curve can be modeled as a series of arcs of varying radius. This allows
smooth arcs to be specified with far fewer blocks of G code, and therefore,
can be executed faster by many controls.

There are CNC controls that allow mathematical functions to be used
to define complex curves, right in the control, and also can handle B-splines,

NURBS, and similar descriptions of surface contours. That, of course, is
NOT RS-274 G-code.

Jon