Homebrew PCBs

the main problem is that the transparent get deformed while passing thru the fusing unit of the printer.

--- On Fri, 7/4/08, Leon <leon355@btinternet.com> wrote:
From: Leon <leon355@...>
Subject: Re: [Homebrew_PCBs] double sided PCB, accuracy
To: Homebrew_PCBs@yahoogroups.com
Date: Friday, July 4, 2008, 1:21 PM










    
            ----- Original Message ----- 

From: "Harvey White" <madyn@embarqmail. com>

To: <Homebrew_PCBs@ yahoogroups. com>

Sent: Friday, July 04, 2008 2:09 PM

Subject: Re: [Homebrew_PCBs] double sided PCB, accuracy



> On Fri, 4 Jul 2008 09:47:55 +0100 (BST), you wrote:

>

> I've always had a conceptual problem doing it exactly this way.  I can

> see that if the joint between the two pieces of paper is exactly in

> the middle of the board thickness, every thing aligns.  If it's not,

> then one layer is offset with respect to the other.

>

> Has anyone considered aligning the masks with a filler made from a

> scrap piece of etched board, same thickness, and then perhaps a piece

> of plastic to duplicate the board?



That has been mentioned on this forum before, it's probably the best way to 

do it. A couple of pegs could be used with holes in the transparencies, to 

make the alignment even better. I think that something similar is used by 

the PCB manufacturers - they use dowels with their phototools.



Leon

--

Leon Heller

Amateur radio call-sign G1HSM

Yaesu FT-817ND and FT-857D transceivers

Suzuki SV1000S motorcycle

leon355@btinternet. com

http://www.geocitie s.com/leon_ heller 




      

    
    
	
	 
	
	








	


	
	


      

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