[Coco] : RePacked Coco used in my CNC project

[Andrew]

> Message: 1
> Date: Fri, 12 Sep 2008 09:12:37 -0500
> From: "George Ramsower" <georgeramsower at gmail.com>
> Subject: [Coco]  RePacked Coco used in my CNC project
> To: <coco at maltedmedia.com>
> Message-ID: <001a01c914e1$9ca00660$d4b1b1d8 at house>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> 	reply-type=original
> 
> http://coco.thetinbox.com/CocoRePack.html
> 
> A while back, some expressed a desire to see how I repacked a CC3 into an 
> old modem cabinet.
> There it is.

George, I love to follow this project. I hope to one day build and use 
my own CNC machine (although, likely to be done under *nix with the 
standard software there), yours really shows what can be done with an 
8-bit, though.

I am glad you have found the problem with the CC3 - I was afraid 
something major happenned with the machine due to the stepper interface 
(do you have a schematic? do you have buffering?) - feedback from the 
steppers or other voltage frying the CPU or GIME. PSU issues like that 
can be hard to figure out because they look like other things.

Can't wait to see more about it!

BTW - you mentioned having issues with accuracy of lines - that you were 
using large arc segments to simulate angled lines. Why not use the 
bresenham (sp?) algorithm to step the steppers instead (there would 
still have to be conversion for the angle and such)? Although, I don't 
know much about CNC machining, so I probably don't know what I am 
talking about here (have you looked into the code used on *nix to see 
how they do it?)...

Anyhow - great work!

-- Andrew