Electronics Forum | Thu Apr 11 20:35:22 EDT 2002 | davef
Messy. Messy. Messy. Consider gluing these components, until you control your process. It is unclear to us that a single factor drives these defects, but multiple factors that need to be tuned to work well together. PAD DIMENSIONS * Some SM-782 pa
Electronics Forum | Fri Dec 08 18:37:01 EST 2000 | Dave F
Asymetry in heating or mechanical forces are the primary reasons for tombstoning regardless of the reflow method. [There's beaucoup of background in the fine SMTnet Archive on reflow tomstoning.] Your situation is curious, but at least you know why
Electronics Forum | Thu Oct 28 16:11:43 EDT 2010 | dwonch
Dealing with these intermittent issues can be frustrating! Can you narrow down if the defects occur during a specific time in the run? i.e. beginning or end? Or, maybe after a pause in printing such as stopping the line for lunch? Are there a lot of
Electronics Forum | Sun May 04 22:10:20 EDT 2003 | Thomas
Did u ever try a anti-tombstone solder paste to try to eliminate this problem ??
Electronics Forum | Wed May 07 09:24:33 EDT 2003 | davef
Kris The majority of our tombstoning in very small passive SMT is caused by imperfections in end-cap solderability protection plating.
Electronics Forum | Mon May 05 18:48:23 EDT 2003 | Kris
Hi, It is expected that lead-free will have reduced tomstoning. As it has a higher surface tension and does not wet as well as the tinlead paste it exibit lower tombstoning. Addiotnaly commercialy available lead-free alloys may not be true eutectic
Electronics Forum | Fri Jul 30 00:21:01 EDT 2004 | Jet
Hi, Very interesting article on tombstone issue, i'm facing tombstone issue for 0805 IDC component, i've redesign the stencil aperture and change to lead free paste, the tombstone is reducing but not fully eliminated, however there is a problem i fa
Electronics Forum | Fri Apr 25 08:48:25 EDT 2003 | davef
If what you say is accurate, two thing come to mind: * Pads on the board are incorrect for the tombstoning components. * Profile is different on the individual pads of tombstoning components. We have heard of, but never seen, components [tants] that
Electronics Forum | Fri May 30 11:23:10 EDT 2003 | dsuraski
AIM has an article that includes anti-tombstoning solder paste information. It's called "Reducing The Tombstoning of Small Discrete Components" and is located at http://www.aimsolder.com/technical_articles.cfm#14 Or I can send a copy to anyone inte
Electronics Forum | Mon May 05 11:35:00 EDT 2003 | Grant
Hi, This is an interesting point. I use Koki paste from Japan, and it's wonderful, however what properties of solder paste would make it "anti tombstone" paste? How does led free effect tomb-stoning? That would be interesting to know. We might go
