[Coco] Proto CoCo

Mark Marlette mark at cloud9tech.com
Tue Aug 29 06:22:41 EDT 2006

As some have pointed out....PCB houses are available at reasonable 
prices today. For me it is the way to go. Professionally done boards, 
routed edges, tested and certified but it does come a cost. 
Prototypes I go with APC. The home brew methods have a problem at 
6-6mils, multi layer boards are impossible.

SB will be multilayer and the next rev of the SuperIDE board will 
also be multi-layer.

Most importantly you target your solution to your project that fits you best.


At 8/28/2006 02:31 PM, you wrote:

>Any board routing that is needed to plug into the MPI or Expansion 
>slot that I do
>would be done by hand. I don't own a mill let alone a CNC mill.
>On 28 Aug 2006 at 13:43, Gene Heskett wrote:
> > Who needs flushcut?  Or a jig other than to hold it in a repeatable
> > position from one board to the next?  Thats what cnc does, accurately
> > driving the cutting bit to near .0001" accuracies, and dremel sells little
> > 1/8" solid carbide bits for, called grout routing bits.  I've carved lots
> > of steel parts with a couple of them.  They also have one that tapers 1/8"
> > down to a 1/16" roundnose, but in brass I found it just plows up the edge
> > of the groove way above the surface of the brass if I try for more than
> > about .003" of depth per cutter pass, like when carving brass nameplates
> > etc.  So using that bit is a bit like watching paint dry or grass grow for
> > a "President" nameplate.  In FR4 pcb material, I expect a pass with a 14"
> > mill bastard file at an angle across the edges might be in order to remove
> > the glass hair left at the board/air interfaces.
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