Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, David Griffith <dgriffi@...> wrote:
>
> 
> The biggest problem, IMHO, with doing surface-mounts by hand is aligning 
> the pins with their corresponding pads.  The Schmartboard line of 
> prototyping boards solves this problem by putting pads between ridges. 
> With an arrangement like that, you can't help but have the pins rest right 
> on their pads.  Driving home tonight, I thought how wonderful it could be 
> if one could put similar ridges onto homemade (or pro-made) PCBs.  I came 
> up with two approaches:
> 
> 1) Spread a photoresist over the board about .2mm thick.  Mask as 
> appropriate to harden the resist where you want Schmartboard ridges.
> 
> 2) This one came later after more thinking.  Come up with a liquid resin 
> that is repelled by metal and attracted to photoresist, bare epoxy, and 
> bare phenolic.  Spray it over the whole board.  Resin will bead up between 
> pads creating ridges for surface-mount pins to snuggle against.
> 
> When I came up with #2, I quickly discarded #1 as too convoluted.  Can I 
> get your ideas on this?  Would it work?  Would you use it?  Who would we 
> talk to about mixing some of this stuff up?
> 
> -- 
> David Griffith
> dgriffi@...
> 
> A: Because it fouls the order in which people normally read text.
> Q: Why is top-posting such a bad thing?
> A: Top-posting.
> Q: What is the most annoying thing in e-mail?
>

no we can use this method "Spread a photoresist over the board about .2mm thick.  Mask as 
> appropriate to harden the resist where you want Schmartboard ridges."