Homebrew PCBs

I like that.  I'll give it a try

On Fri, Feb 12, 2010 at 8:28 PM, Russell Shaw <rjshaw@...>wrote:

>
>
> Barry Demers wrote:
> > Thanks. I have had a miserable time with the transfer method, and have
> > pretty much given up on that procedure. Lining up 2 pieces of film is
> > leaving me stumped so far. I am aware of using pins for mechanical
> > alignment, but how do I use pins and get that assembly into the glass
> > holding frame? I have read where some people use a pocket arrangement by
> > oversizing the films, and sliding the pcb into a pocket created by gluing
> > the 2 pieces of film together on 3 edges.
>
> Cut 3 squares of 1/16" thick foam tape and stick to 3 corners of one film.
>
> Overlay the other film on top and align tracks. With a finger holding down
> the film to stop it from moving, remove the plastic backing from the 3
> squares
> of tape and press the top film onto it.
>
> In less than 30secs, you have a perfectly aligned pocket that is the same
> thickness of the 1/16" pcb.
>
> There's nothing quicker and easier. The tape can be found at most
> newsagents
> and supermarkets.
>
> http://www.uline.com/BL_6015/3M-Double-Sided-Foam-Tape
>
> > That seems to be the most reasonable at this point.
>
> Definitely.
>
> > Laminating 2 single sided boards together sounds
> > about the most foolproof, but certainly not the cheapest.
>
> Another problem is that the printout can be warped in all kinds of
> directions
> because the laser printer heats the paper. That makes double-sided
> alignment
> difficult.
>
> I have a box full of cheap pcb offcuts from a pcb fab, and can apply
> negative film resist to them that Adam Seychell was selling.
>
> > On Fri, Feb 12, 2010 at 2:10 PM, sailingto <sailingtoo@...<sailingtoo%40gmail.com>>
> wrote:
> >
> >>
> >> There have been several folks who make double sided that way - I did
> once
> >> and it worked just fine. Now I use double sided board with toner
> transferred
> >> to both sides. Takes a bit to make sure they line up, and I tend to have
> one
> >> side with most of the traces, and only a few large traces on "back"
> side.
> >> That way it doesn't have to line up exact.
> >>
> >> Ken H>
> >>
> >> --- In Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com><Homebrew_PCBs%
> 40yahoogroups.com>,
> >> "demers_barry" <sdad@...> wrote:
> >>> Any success with taking .032 single sided and gluing to another to form
> a
> >> 2 sided board. This seems plausible to me, but interested if anyone has
> >> actually tried it.
>  
>



-- 
Thank you,

Barry


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