SCSI to IDE
trag at io.com
Wed Dec 1 10:12:31 CST 2010
> Date: Tue, 30 Nov 2010 13:59:11 -0800
> From: "Chuck Guzis" <cclist at sydex.com>
> On 30 Nov 2010 at 18:56, Alexandre Souza - Listas wrote:
>> - I can design a PCB at home using free tools (Kicad rulez!) - I
>> can make boards good enough for fine pitch SMD at home (see my page,
>> http://tabalabs.com.br/eletronica/tts/index.htm) and the equipment is
>> all made from junk.
> Some very nice work, Alexandre!
Yes, it is.
How did you drill the holes?
The issue that always stops me from taking up toner transfer PCB
fabrication is drilling the vias. I calculate that my typical 8" X 10"
panel of boards is going to have about 1000 vias on it more or less.
Even if I stack several boards, peg them together and drill them all at
once, that's an awful lot of fine pitch holes to drill by hand.
By the time I contemplate, design, and build some kind of automated hole
drilling machine, I'm back to thinking that paying for fabrication is
cheaper. Getting mil resolution on a mobile drill head is not a simple
task, or so it appears to me.
Then if I solved the drilling issue, or just buckled down and did it by
hand, plating the through-holes either involves an intricate and slightly
dangerous (and more importantly, takes up lots of space) copper
electroplating capability or soldering a wire in every via, which is back
to vast tedium. Grommets are too large for the vias I usually want and
also are so expensive it's generally cheaper just to pay for fabrication.
Anyway, solving the drilling and plating issue is what stops me from home
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