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@...> 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>,
>> "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.