Electronics Forum | Mon Dec 13 11:21:41 EST 2004 | wikunkle
To us the system seems very good. Mount & dismount is simple and solid. As a stencil supplier, we know there is another system that solves the sharp edge issue, called Wizard/QTS. DEK likely has the edge in a high prod. environment. Bill
Electronics Forum | Tue Dec 14 08:32:10 EST 2004 | davef
Depending on the design, materials selection, end use, etc; we'd expect the FIT of an electronic assembly to be between 30 and 100+. There is no standard.
Electronics Forum | Tue Dec 14 10:58:56 EST 2004 | Peppe
Thanks for your answer Dave. Just a clarification. Given FIT is for just one soldering or for a specific number ? I mean cards we produce have, typically, 10000 soldering joints. Which is the expected FIT of that card ? Thanks again for your help.
Electronics Forum | Mon Dec 13 12:02:20 EST 2004 | Rob
I've seen 2 types from China, one type was an amazing copy (Fuji supplier's factory back door possibly?) and the other was a cheap copy. The cheap copy was adequately functional, but I wouldn't want to bet on it's long term life.
Electronics Forum | Mon Dec 13 12:29:12 EST 2004 | fastek
Interesting Rob. The fake ones that I was told about would fail within minutes as the index wheels would be reduced to metal shavings right away.
Electronics Forum | Mon Dec 13 14:13:39 EST 2004 | Gary
We are setting up our criteria for acceptance of solder voids. We would like 2% to 4% or smaller as our tolerance. Does this sound reasonable? Are most x-ray machines able to accurately measure at that size? Also, do most people find that 2% to 4
Electronics Forum | Mon Dec 13 14:41:41 EST 2004 | DasonC
Check IPC-7095, 7.4.1.6 For Class 2, 45% of the diameter adn 20.25% for the area.
Electronics Forum | Tue Dec 14 08:01:14 EST 2004 | paul_fisher
Our paste is no new we have used it before [Cobar no-clean paste]. The solder joints look like they are bursting out salty looking crystals. Maybe the board cleaning is a red herring in that if the boards are clean it stops this crystalisation travel
Electronics Forum | Tue Dec 14 11:34:34 EST 2004 | saragorcos
You may also want to contact Terry Munson at Foresite - he is very knowledgeable about the root causes of dendritic growth - you can reach him at 765-457-8095 - he can more than likely provide you with some good advice. Sara
Electronics Forum | Tue Dec 14 16:43:53 EST 2004 | Guest
Yes, the (large) company where I work has the policy not to use leadfree BGA's in the "old" process, so it's not unusual. Be prepared to have more customers having this opinion.
