Re: CNC Etch-A-Sketch, EggBot

Hi Fred,

Yes, I heard from Bruce Shapiro, of the EggBot site, and it sounds like
he did something like the spring loaded pen for Z.

As for the digitizing, once one knew the "surface", I see what you're
talking about getting a "template", and rotating it for the extrusion.

I've got some digitizing code working (slow), and I'm planning on
working on radial digitizing (inside holes, outside round objects).

Guess I'll have to read up more on the "Z-A swap trick", or use
"Vector's Wrap cylinder", which I can follow. VectorPlus rotary 4th
axis is something I what to explore, but that will have to wait for a
future software purchase! Maybe it'll show up on "Listserve Special
discounts" sometime! ;>) Or I'll find a CNC project that pays!



Best regards and wishes for a happy holiday season!


IMService wrote:

>
> > Date: Sun, 30 Dec 2001 00:04:10 -0800
> > From: Alan Marconett KM6VV <KM6VV@...>
> >Subject: 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
>