Electronics Forum | Tue Jan 17 09:23:23 EST 2006 | trk
Here's my 2 cents worth.....as if anyone cares??? Spend: 1 million for a machine = 1 million in R&D on the machine 100,000 for a machine = 100,000 in R&D on the machine. if spending the 100,000, then you need to hire a qualified engineer to maintain
Electronics Forum | Thu Jun 17 07:04:03 EDT 2004 | davef
It sounds like the parts are not soldering properly [have poor solderability]. This probably due to corroded nickel underplate caused by: * Nickel that oxidized, while awaiting overplating * Poor quality tin overplate, allowing nickel to oxidize aft
Electronics Forum | Wed Jun 16 04:14:11 EDT 2004 | loz
I have used this method as well, it did have its drawbacks though. We used to have the positioning holes etched into the stencils and this worked fine, for a while. After a couple of months of opening up and closing the fingers on the hanging rack, w
Electronics Forum | Thu Jun 24 12:30:06 EDT 2004 | deonn
Thank you for your input Russ. I do understand the technical challenges that 0402-0201 present. As a matter of fact, I personally think it is a bad idea for these devices to even be processed using conventional assembly methods when the alternative
Electronics Forum | Thu Jun 24 23:00:36 EDT 2004 | yukim
Tried with several lots of solder paste, manufactured in Feb and March this year. Work ambient: 25C, 60~70%. Is this humidity too much? I'll reduce the ramp in our profile. One change: We changed the conveyor motor in our reflow oven just before the
Electronics Forum | Wed Jun 30 10:24:27 EDT 2004 | K
We find keeping the work environment at about 22degC and humidity to about 40-50% is the best way to control the solder balls. Before we took measures we were out of control with solder balls especially in the summer months. We run aqueous solder thr
Electronics Forum | Mon Jun 28 22:12:24 EDT 2004 | davef
Things to consider are: * Thermal expansion characteristics of you flex and your pallet should be better matched. We use G-10. * Placement of your two sided tape should be better, more uniformly distributed. We run strips the length of the flex that
Electronics Forum | Sat Jun 26 10:27:17 EDT 2004 | mskler
Hi all, We are facing prob. in MPEG card. WE are using 6 mil stencil with steel squeezee. There are two 20 mil Ic�s. Once we set profile according to the profile given by the supplier after that we made 2000 nos of boards & in first shot almost b
Electronics Forum | Tue Jul 06 17:10:19 EDT 2004 | Pete
Quality, consistency and labor savings all wrapped up into one nicely packaged piece of electro-mechanical marvel called AOI. Look for the number of templates one can store per component, lighting options, can it do through hole? Look at reporting
Electronics Forum | Wed Jul 07 13:37:56 EDT 2004 | mark
Not sure if this helps but found this site that outlines % of N2 against O2 ppm levels. You need 99.99% N2 purity for http://www.tkb-4u.com/articles/consumables/whatisnitrogen/whatisnitrogen.php Most customers we have worked with in the past run an