Homebrew PCBs

I have a dirt cheap laser, the Samsung ML-1210. It makes artwork 
that is pretty well perfect. No pinholes or dropouts and large black 
areas are nice solid black. My DJ-610C does pretty good too but its 
a bit dicey going smaller than 0.015" - ground planes are streaked 
somewhat (have to ink them over to use).

My first set of boards all had .012" traces on 0.025" centers (I 
didn't know that was supposed to be hard - newb me!) and they 
exposed/etched just fine once I figured out my artwork wasn't 
sitting flat and got my chemical temperatures/times sorted out.

Since I've gotten some more practice, I've been using 0.01" traces 
at times without defects (only when I have to, other than that I go 
BIG - if you have the room, why not use it!). Haven't had the need 
to go smaller than 0.01" but I could give it a shot with a little 
left over board I guess.


--- In Homebrew_PCBs@yahoogroups.com, Russell Shaw <rjshaw@i...> 
wrote:
> Hans Wedemeyer wrote:
> > Mike,
> > I agree with you 100% that's why I displayed some practical 
everyday
> > proven results.
> > 
> > And yes you never did tell Russell to shut up. Russell said he 
would
> > shut up if someone can show him a QFP etc etc
> > 
> > Well I wasted a good Apollo transparencies to prove to myself 
that it
> > can be done.
> > 
> > It's the constant misinformation or lack of acceptance that 
other people
> > can use lasers  that bugged me as much as it did you, that why I 
named
> > the thread the naked truth...
> > 
> > I'm done trying to convince Russell, he will not believe me even 
if I
> > sent him the final PCB...
> 
> The only convincing i needed was that someone had a proven example.
> It was hardly misleading information until a concrete example was 
done.