Re:Gcode

Thanks Jon,

So it sounds like BobCad's changing to a 'flat' plane is a similar way
to do it. I didn't get that (or suspect it) while I was trying out
their demo. Then a "better deal" (for me, VectorCAD/CAM) came along,
and I have been concentrating on it since. Being probably the first
CAD/CAM program I saw, I still like BobCad, and will probably need to
buy a copy at some time. Some Work I could do with an old Air Force
buddy of mine in his Closed Circuit Rebreather (SCUBA stuff) business.
Maybe I'll convert him. :>)

Alan (learning)

Jon Elson wrote:

> Alan Marconett KM6VV wrote:
>
> > Anyone have a few lines of gcode that demonstrate cutting arcs in the
> > other planes? Like, when do you do that? A "curved" bottom pocket and
> > a
> > ball end-mill??
>
> Yes, precisely!
>
> > I notice that (if I understand it) VectorCAD/CAM likes to draw arcs in
> >
> > the X-Y plane, you rotate into that plane when you want to draw an
> > arc.
> > Is that typical of other cad programs? It's taking a while for me to
> > get my head around 3D! Probably too long away from mechanical drawing
> >
> > in college. I never got that far (drawing 3D) in the "demo" BobCad.
> > I
> > have no idea how to do 3D there. Any comments? I think there must be
> >
> > some correlation between machining 3D and drawing 3D. Helps the mind,
> >
> > anyway.
>
> In Bobcad/CAM, you mostly rotate the 'page' with the select view
> controls until
> the plane in which you want the arcs to appear is 'flat' with respect to
> your screen.
> You then draw your arcs, and then maybe rotate back to the XY plane, and
> use
> trim/extend to join places on the arcs to the rest of the part. It is
> not intuitive
> or easy, but it works.
>
> Jon
>
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