Electronics Forum | Wed Feb 19 21:20:17 EST 2003 | davef
Consider: * http://www.ecd.com/Seminars/bobwillis.asp * http://www.assemblyonline.com/ Intro%20to%20Surface%20Mount%20Technology%20T&CF.doc * http://www.smta.org/ * http://www.rayprasad.com/training.html * http://www.omnitraining.com * http://ww
Electronics Forum | Fri Nov 07 08:12:24 EST 2003 | caldon
From my understanding (and I am not a metalurgist)Most Lead free solders can be intercahngeable.The alloy created should be stable. The issue is if you add Leaded solder to the joint. Obviously, research and testing is still pending. cal
Electronics Forum | Sun Dec 07 13:16:23 EST 2003 | Kevin Gilbraith
With totally stable screen print (solder paste), placement and reflow processes, what is a world class target first time yield for good pcbs? How bad is 65% FTY. Your views would be welcome.
Electronics Forum | Tue Jan 21 11:03:15 EST 2003 | MA/NY DDave
Hi You already received good answers. A thing to remember is the components and the PCB. How high you go above 63/37's 183C should be limited to create a good solder joint. Too long creates problems since the components and the PCB start to be he
Electronics Forum | Tue Feb 25 15:29:46 EST 2003 | MA/NY DDave
Hi Locktite is telling you to cure first, maybe for a good reason. So the epoxy becomes stable just before solder reflow moves stuff around and around and then settles. A WEG yet if you did some cross sections and analysis you might find piles of
Electronics Forum | Tue Mar 04 16:41:42 EST 2003 | MA/NY DDave
Hi I think you answered your own question. How much depth have you already established If 0 than commissions are high and base salary high Without a base salary forget it for a good professional If a cake walk due to past practices than commi
Electronics Forum | Tue Sep 23 17:52:12 EDT 2003 | lysik
I work for a large Contract manufacturer. We use Fuji Siemens and Universal. Universal is by far the most stable reliable system. They always have the parts in stock we need. Great support. Samsung has now pulled out of direct sales in the US. I woul
Electronics Forum | Tue Aug 05 09:12:34 EDT 2003 | caldon
All of our PNP machine run on UPS back up. Though our machine controller is Dos and failry stable it is integrated with Windows NT who does not like to be prematurley shut down. We get a window of about 4 hours from the UPS. Remember this is just o
Electronics Forum | Thu Aug 14 09:34:46 EDT 2003 | davef
We can solder and clean lead-free in well-controlled and stable processes. We have no reason to believe that products made with lead-free will be reliabile. We know that lead-free soldering is worse for the environment than other less costly proces
Electronics Forum | Mon Mar 03 13:22:20 EST 2003 | MA/NY DDave
Hi I see David F already gave a good answer. The basic advantage, if you can afford it, is a more stable PCB during the soldering process. Higher Tg enables this. Also some materials serve to match CTEs (coefficient of thermal expansion) a bit bett
