Homebrew PCBs

Hans.
     When you mill a board, you hit the board material. The copper
is soft. The glass epoxy board is like sand paper to the bit. I
used to coat the board with motor oil before milling. It only helped
to keep the dust down. Lets face it, there is no easy way to make 
PCBoards. Every method has its drawback.

                                       John

                                        





--- In Homebrew_PCBs@y..., hans@c... wrote:
> Alan,
> The Gerber files include "empty" layers. The Modular design is a two
> sided PCB, simply discard the empty layers.
> BTW I do not mill boards it's far too mauch work, I use Pre 
Sensitized
> stock and exposure for 120 second using a GE 500W bulb,
> then developing in a solution of Red Devil Lye, etch with Ferric
> Chloride, the same Ferric Chloride I have been suing for 8 years !, 
most
> people do not understand it, and they throw it away far too soon. 
Heck I
> even use the same Red Devil Lye mixture until it's so green I can 
hardly
> see the PCB developing.
> .... I can make a two side board (without drilling) in about 45
> minutes... 5 mill traces at 8 mill spacing are normal.
> BTW mill bits, I wonder why mill bits wear out so quickly, after all
> it's only copper! Could it be because people run the bit dry ? May 
be
> people are not buying real mill bits...
> I have a link at my site for a source of really good quality mill 
bits,
> size down to 0.002" ( yes! 2 mil ) But 2 mil bits are not that 
cheap....
> 
> hansw
> 
> 
> Alan Marconett KM6VV wrote:
> 
> >  Hi Hans,
> >
> > That's quite a nice project!  I think I counted 8 layers in one 
of the
> >
> > GBR files!  And with over 20 apertures, I'll have to get a parser 
for
> > the header working!  I think I can pick a layer or two with pads 
and
> > traces, and manually build an aperture table for some simple tests
> > with
> > my code.  I was able to see a lot of the "foil" layers by using 
some
> > aperture sizes I had defined previously for another (Eagle) demo
> > board.
> >
> > Thanks for the URL!
> >
> > Alan  KM6VV
> >
> >
> > hans@c... wrote:
> > >
> > > crankorgan wrote:
> > >
> > > > What I find is people are unable to find anything on
> > > > the internet. Maybe they use the wrong search engine.
> > >
> > > I posted a complete design with PCB layout files and schematics 
at
> > my
> > > web site, during
> > > the past years I have received 100's or emails from people that 
have
> >
> > > successfully built the
> > > Modular Design, with or without the "Smart Current Monitor".
> > >
> > > The design is Free... I do not charge anything for it..
> > >
> > > When I get time I'm going to post a new design complete with 
EAGLE
> > > files...
> > >
> > > Hans W
> > > http://hans-w.com
> >
> >
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