Re: gEDA-user: wacky (or not?) solder stencil ideas

[Dave N6NZ <n6nz@xxxxxxxx>]

DJ Delorie wrote:

> For my sized boards, I usually end up with one web etched through
> somewhere and one hole elsewhere not etched through.

Same deal with laser cut mylar.  I just tweak and recut until I get 
something that works.  For TQFP, I make the pads very narrow since they 
bloom due to combined beam kerf and meltage, that preserves the webs. 
Then tweak the laser power until I get clean web everywhere, and clean 
up any incomplete apertures with an X-Acto.

> 
>> I've tried 65# card stock, mainly because it was handy.  Too thick
>> for a stencil, 40# might be about right?
> 
> 20lb is 4 mil, just right.
> 
>> I'm concerned about contamination from carrying ash residue 
>> into the solder joint.
> 
> Flux should fix that?

I'm no chemistry whiz, so if that's true I'd like a smarter person than 
me to tell me so :)  If a residual amount of paper ash is not going to 
contaminate the joint, then a paper stencil might be an excellent option.

-dave


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