Homebrew PCBs

I regularly do 12 mil traces with TT.  I can get good results with 10
mil traces but I prefer a little safety margin, especially if I get a
slow etch.

I align my top and bottom artwork on a homemade light table.  I use a
double sided tape dispenser from Scotch to stick them together once
aligned.  cut off the excess paper (leave a 1-2 inch margin for the
tape), slide the blank in and align it on the light table.  Then its
into the laminator inside a carrier.  I use children's construction
paper for that as it is soft and becomes conformal after the first pass.

--- In Homebrew_PCBs@yahoogroups.com, Philip Pemberton <philpem@d...>
wrote:
> Hi folks,
>   Has anyone done any testing to see if it's possible to go down to
12/12
> track width/spacing with the Staples photo paper (or PnP Blue)?
> 
>   I've got a double-sided PCB here that won't route (without a
stupid number
> of vias) in anything above 12mils. If it's not possible to go down
that far
> with the Staples paper and a 600dpi laser, I'll send the boardfiles
off to
> Olimex. Otherwise, I'll try and make the board myself :)
> 
>   While I'm at it.. has anyone got any tips for aligning the two
transfers
> for top copper and bottom copper?
>   Also, does anyone know if toner is conductive - I was planning to
put a
> placement guide on the top layer, but not if it'll end up shorting
everything
> out.
> 
> Thanks.
> -- 
> Phil.                              | Acorn Risc PC600 Mk3, SA202,
64MB, 6GB,
> philpem@p...              | ViewFinder, 10BaseT Ethernet, 2-slice,
> http://www.philpem.me.uk/          | 48xCD, ARCINv6c IDE, SCSI
> ... Clairvoyant meeting cancelled due to unforeseen events.