Homebrew PCBs

Well, line up is not a problem. it's the transparent getting deformed when heated.

--- On Fri, 7/4/08, DJ Delorie <dj@...> wrote:
From: DJ Delorie <dj@...>
Subject: Re: [Homebrew_PCBs] double sided PCB, accuracy
To: Homebrew_PCBs@yahoogroups.com
Date: Friday, July 4, 2008, 5:50 AM










    
            

What I've been doing is including a "target" in my prints (four 25 mil

squares in a square, with a 1 mil gap - that translates to a 1 mil ink

crosshair when I print negatives).  I print this on all photomasks and

one on plain paper.  The plain paper one I use to pre-drill 16 mil

holes at each crosshair.  Then, when exposing, I can line up the holes

with the crosshairs pretty accurately, and double-check through the

glass overlay.


      

    
    
	
	 
	
	








	


	
	


      

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