Re: [CAD_CAM_EDM_DRO] Re: How to go from 2.5 D to real 3 D ??

Alan Marconett KM6VV wrote:

> Hi Fred, Rab and others,
>
> So what I see is I can cut 3D with a tabletop machine, using MaxNC,
> CNCpro, Master5 or something similar, as long as I do it with a lot of
> little line segments.
>
> We do plenty of arcs in XY plane (G17), and perhaps some do arcs in XZ
> or YZ (G18, G19) as well. As far as I've learned, arcs must be in one
> of these planes, unless line segments are used to generate an arc.
>
> Are there controllers (and CAD programs) that can generate true arcs in
> other then these defined planes? I can see how to draw an arc in CAD,
> and then rotate it in an axis. I don't recall any Gcodes (NIST, RS274)
> that hint at a way to revolve, or define a plane in either then the
> mutually perpendicular planes. I have no idea "how they do it".

The RS-274D spec lists G72 and G73 as the G-codes for 3-D circular
interpolation. G06 is listed as the code for parabolic 3-D interpolation.
I have no idea what controls actually execute these interpolations.

Jon