Electronics Forum: laser cut stencils (Page 36 of 55)

Solder Mask

Electronics Forum | Fri Apr 22 11:27:14 EDT 2005 | chunks

SMT adhesive works great! We actually cut stencils to print adhesive in between areas that always solder short over wave. It's the perfect solder resist. Change a customers board? I thought only Satin could do that?

Wave solder bridging

Electronics Forum | Thu Jun 26 13:24:25 EDT 2008 | realchunks

Do you glue SMT parts on the bottom? If so, use your SMT glue to prevent the short. Just cut a new stencil with 0.020" wide apertures between the pads of the connector (bottom side). We do it all the time.

Fill a stencil openings with what?!

Electronics Forum | Thu Oct 09 07:35:04 EDT 2008 | smtnet51

Yep, they are cut all the way through and you are correct, they do not stay in there very long. Then when they pop out you wind up pasting the fids on your pcb, not ideal!

Glue

Electronics Forum | Thu Sep 24 17:36:12 EDT 2009 | davef

Both of the articles talk about pockets cut in the contact side of the stencil that correspond to components [or PTH leads] that would allow PTH first, glue second, and finally second-side SMT placement.

Fine Pitch Printing Issues

Electronics Forum | Tue May 25 17:04:34 EDT 2010 | remullis

Yes, I use Indium Mesh 3. I have a re-cut stencil on the way. Thanks for the input!

QFN aligment issues

Electronics Forum | Fri Jun 29 15:41:58 EDT 2012 | dontfeedphils

I guess I would atribute it to either board stretch/warpage or someone messed up, whether it be the gerbers aren't quite right or the stencil wasn't cut exaclty as the checkplot was laid out.

Is there any good articles to read on solder paste?

Electronics Forum | Thu May 30 09:14:03 EDT 2013 | emeto

I have another idea. Would you check the apertures on the stencil? May be they didn't cut the right size apertures there. If you have smaller aperture you can't get the right amount of paste.

Stencil Manufacturer

Electronics Forum | Fri May 05 12:48:18 EDT 2017 | emeto

You can cut space saver hard frames now everywhere at lower price, so I wouldn't recommend Vector Guard as it adds additional expense to get the frames.Maintenance of the frames adds more time and expenses as well.

Re: Solder paste print with two thicknesses

Electronics Forum | Thu Oct 08 22:20:44 EDT 1998 | Dave F

I am trying to find out, what possibilities I have, to print solder paste on a board, when the task is to have 120 Microns thickness for the biggest part of the board (85% of the real estate), and then have 250 Microns of thickness on the rema

Re: Solder paste print with two thicknesses

Electronics Forum | Fri Oct 09 04:08:45 EDT 1998 | Thomas Blesinger

I am trying to find out, what possibilities I have, to print solder paste on a board, when the task is to have 120 Microns thickness for the biggest part of the board (85% of the real estate), and then have 250 Microns of thickness on the re


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