Electronics Forum | Wed Dec 10 14:37:47 EST 1997 | Frank Murch
There is a direct relationship between adhesive strength and surface area. If you graph this it will be linear. The amount of the adhesive should be about 2/3 the gap between the pads. Pad designs change all over so a true and tried rule does not ex
Electronics Forum | Tue Aug 07 16:12:13 EDT 2001 | Michael Parker
In addition, consider: Solder paste selection, including clean or no-clean is also quite important. This can vary from application and is somewhat process dependant (what works best in the environment). Relow profile. A must for many reasons. And
Electronics Forum | Wed Aug 08 04:00:46 EDT 2001 | jackt
Folks, I 'm in progress of generating the DFM checklist for New Product Introduction on PCA. I need some reference articles to prepare it apart from IPC-SM-782 (surface mont design and land pattern standard)that I'm using now. Any idea of extracti
Electronics Forum | Mon Oct 08 02:12:21 EDT 2001 | george
I do not doubt about the power of the 552 and 580, but in some cases it may be overdone. For just a simple (straight forward) shear test, you can also look at: http://www.chatillon.com/products/dpp.html (�Low Capacity Mechanical Force Gauge. These er
Electronics Forum | Fri Sep 07 08:57:28 EDT 2001 | Hussman
Por, You talking wave solder or reflow solder? At wave, nitrogen is the way to go. Just like you stated, it does affect the surface tension. If you're reflowing, I wouldn't go nitrogen unless you have to. Improper stencil design is usually the c
Electronics Forum | Tue Sep 11 10:18:03 EDT 2001 | davef
In line with the previous poster's comments, * BIG SMT EMI shields are tough to reflow. * SMT EMI frame and snap-in cover [after reflow] shields work fine. The SMT EMI shield design that we like the best is from Instrument Specialties, EZ Peel PCB
Electronics Forum | Mon Oct 01 15:28:50 EDT 2001 | roland
Steve, Thanks for the note about the library... Good timing too as we are in the process of revamping the library. Your input is always welcome and we would appreciate any ideas you or other SMTnetters would like to provide about the new library d
Electronics Forum | Wed Oct 24 09:11:54 EDT 2001 | John S
Does anyone have any guidelines or IPC standard they can suggest for specifying the type of solder mask used? We've started having problems with poor masking, and when I asked our designers what they use as a specification, they can't give an answer
Electronics Forum | Thu Nov 01 13:08:33 EST 2001 | dave231
I am just starting to get into sub 50mil pitch, but from what I can see you are correct. But I can help with solder stencil. I cut the width only half of what the pad is, but the keep the length the same. This has helped but does not fix always. Stil
Electronics Forum | Thu Nov 01 17:37:23 EST 2001 | davef
Try: http://www.bcpa.org/ http://www.drj.com/ http://www.fema.gov/library/bizindex.htm http://www.drj.com/new2dr/samples.htm NeoSafety (http://www.neosafety.com) Crisis Manager: Business Interruption Recovery Tool. Designated as a "Best Practices" so
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