--- 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."