Re: CNC Etch-A-Sketch, EggBot

Hi Bill,

Hold the egg from one end? Maybe some type of suction device? I'd
really like to apply the little floppy disk stepper motors (I've got a
bunch of 'em), I'll have to see how much weight the 'X' axis can hold
(moves the 'Y'). I think I've got the axis right, 'A' rotates the egg,
'X' transverses along the axis of the egg, and 'Y' must be radial to the
egg's axis.

And "work" the entire end? Bruce's unusual 'X' axis eggpoach (approach,
sorry!) could address that, I think!

Alan KM6VV
(Egg-a-holic)


Bill Vance wrote:

>
> Hi gang;
>
> This might be ok for making a decorative band around the egg, bu what about the
> ends? You have two totally different hemispheres there. Even though it would
> take two times through through, "the mill", some designs would be easier to
> implement from the ends, and maybe easier to hold the egg, too.....
>
> Bill
>
> On Sun Dec 30 08:46:02 2001, IMService, <imserv@...> wrote:
>
> >> Date: Sun, 30 Dec 2001 00:04:10 -0800
> >> From: Alan Marconett KM6VV <KM6VV@...>
> >>Subject: Re: Re: CNC Etch-A-Sketch, EggBot
> >
> >Alan I would think the easiest way to do the egg would be to treat it as a cylinder and have a spring loaded pen for the Z variations of the eggs surface.
> >
> >My second choice would be to digitize the form. One set of points along the longest axis would be all the probing needed, and then use an arc-spline of the points to create the template for the extrusion.
> >Draw the design in the flat, then use the extrusion template to create a 3D unrolled representation of the surface. You could then use the Z-A swap trick to develop the G-code for the surface, or else, use Vector's Wrap cylinder to develop the 3D surface, from which you could either draw X-Y-Z coordinates using about 1/4 of the surface and indexing, or else use the VectorPlus rotary 4th axis to generate the entire drawing path directly from the model.
> >
> >Best Regards, Fred Smith- IMService
> >Listserve Special discounts and offers are at: http://209.69.202.197/cced.html
> >