Electronics Forum | Mon Jan 26 08:58:05 EST 1998 | Mike McMonagle
| I have the following questions with regards to the solder printing stencil design : | 1) Is the Electro-polish process recommended for laser cut stencil ? | 2) Should the aperture walls be slanted at an angle or straight wall, i.e. trapezoidal |
Electronics Forum | Wed Mar 04 21:24:04 EST 1998 | Ron Costa
Hello everyone! Does any know anything about bare board size variations? Is there a spec. or tolerance? I'm running small lots of boards and during the screen printing process I find that I cannot paste each board perfectly.I've tried other screen pr
Electronics Forum | Thu Aug 12 22:38:44 EDT 1999 | Dave F
| Hello | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | 100 durometer blade. Getting "tails" on deposi
Electronics Forum | Tue Aug 17 10:41:13 EDT 1999 | Steve A
Wayne, Sounds like a gasketing problem. When the horizontal apertures are bleeding but not the vertical apertures. Could be poor underside support, HASL miniscus issues, masking or plugging issues, but what many people do not account for is that t
Electronics Forum | Tue Apr 26 15:58:04 EDT 2016 | deanm
We have in-house PCB fabrication capability for items such as simple single-sided prototype boards, copper shields and copper stencils for our paint shop. We are having difficulty acquiring small containers of chemicals, especially developer and stri
Electronics Forum | Fri Aug 13 12:52:17 EDT 1999 | Steve Schrader
| Hello | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | 100 durometer blade. Getting "tails" on deposi
Electronics Forum | Thu Dec 08 08:22:58 EST 2005 | grantp
Hi, How fine pitch are you going? What kind of stencil printer are you using? We had a manual stencil printer and needed to print 1-mm pitch BGA and needed to go to laster cut and electro polish at 4 thou to get good paste release. We also went 1:1
Electronics Forum | Thu Apr 01 22:21:45 EST 1999 | Dave F
| We make an excellent chem-etch stencil. Our customers have had success printing 16 mil pitch without a problem. This is not an advertisement! | | When we try to sell our product to new customers, we find more and more people willing to pay more fo
Electronics Forum | Thu Mar 05 13:17:19 EST 1998 | Justin Medernach
| Hello everyone! | Does any know anything about bare board size variations? | Is there a spec. or tolerance? | I'm running small lots of boards and during the screen printing process | I find that I cannot paste each board perfectly.I've tried other
Electronics Forum | Sat Nov 13 14:09:45 EST 1999 | se
First, let me say what I always say: a good chem-etched stencil will print fine pitch. Chem-etch brings trap to the side walls because its a physical by-product of the process. Because they are less expensive you can add electropolish and still save
