Homebrew PCBs

Many years ago I used a variation on the pocket method.  I taped the
negatives to a spine of PCB material.  They would be aligned as the second
side was being taped on.  You can align the features with the negative
pinched together as long as each negative is pinched in the same distance
and angle from the spine to remove parallax error.  I thought that the spine
would allow the two negative to be flat to the board being exposed so there
was no stress on the negatives.  I was able to make several consistent
copies of a board this way.

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Piers Goodhew
Sent: Sunday, January 01, 2012 9:08 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Double-sided on random-size board?

I've recently tried the "pocket" method, which DJ Delorie has mentioned here
a few times: you line sides A and B up through a light and staple them
together, then just slide the PCB in. My results were pretty close, but, oh,
a few mil (< 10, >= 5) out - which could be due either to either the
alignment or the (non)-perpendicularity of my hand drilling or both.

(my previous method: avoid at all costs, has also worked well)

Keep meaning to share photos as it's not a bad board, but what with moving
countries, it's not easy.

PG

On 02/01/2012, at 3:54 PM, DaveC wrote:

> I want to make a double-sided PCB on board stock that isn't cut to 
> size. In other words, what technique can I use to align the 2 toner 
> printouts such that the vias align?
> 
> Normally you use the corners of a pre-cut board, but if you don't 
> have that, what other options for alignment are there?
> 
> Thanks,
> Dave
> 



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