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 _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
