Homebrew PCBs

> On 29-Apr-07, at 6:15 AM, fredbutz wrote:
> >
> > But now I want to do a double sided board.
> >
> > Does anyone have any suggestions for lining the sides up
> >
> >
> Anyone having trouble with alignment due to expansion of the 
> paper? Whenever I transfer the image onto my boards, its 
> always much larger than when it comes out of the printer. I  
> assume that its due to the heat of the iron.
> Anyway, it seems to make dbl sided boards nearly impossible. 
> Any suggestions on how to avoid this?


Run the paper thru the laser a few times before printing the PCB image.  

Since it can be a bit hard to print a blank sheet, make a small text file,
(just a single word will do), and print that to the same page a few times.
Then print the PCB.

Movement is caused by water content.  When printing the paper dries out, so
it shrinks or warps a bit.

You need to use the paper straight away, before it starts absorbing water
from the air.  Don't forget to turn off the steam option on the iron too!
:)

Tony