Electronics Forum | Wed Dec 22 23:29:57 EST 2004 | KEN
Check with Dupont's web site. They have a wealth of information on the various polyimide products they manufacture. I was quite surrised at the differences in materials and in particular the dimensional stability and hydroscopy. Good stuff mayna
Electronics Forum | Wed Feb 09 10:40:56 EST 2005 | primus
Another question about Set Command Variables. We use fixed dimension, multiple window PCBs in all of our UIC machines. It is often required that we use the rotary table to populate the entire panel, but this means that for each rotation, either the w
Electronics Forum | Mon Feb 21 13:35:04 EST 2005 | pmdeuel
we have a HSP 4796, and have had placement issues with 0402's. If you can rule out global correction, rev'ed boards and a loose nest or a lack of support under the board. Look at placement before reflow. If alignment problems are present before oven
Electronics Forum | Tue Feb 15 21:27:18 EST 2005 | davef
Component shelf life depends on: * Solderability protection type. * Quality of process and materials used in applying solderability protection. * Duration of time from when the solderability protection was applied. * Packaging used in component stor
Electronics Forum | Fri Feb 18 13:26:49 EST 2005 | GS
Thanks Dan. Q. to all : any EMS experience like when your Customer audits your facility for manufacturing readiness and when they ask you: what about control of component vintage ? or how do you handle the component shelf life on your facility? etc
Electronics Forum | Thu Mar 10 12:19:17 EST 2005 | rlackey
Borrow a large hungry dog (or wolf if local wildlife permits) & chain it up in the corner of the office when the salesman comes in. Then look over at it repeatedly whilst talking about your requirements. Feel free to leave him alone for a while...
Electronics Forum | Thu Mar 17 10:24:43 EST 2005 | Bob R.
I can't answer your question directly, but we're an automotive supplier and we don't do dual reflow with QFPs because of their moisture sensitivity level. We don't have the processes in place to manage the time between first and second pass so we'd
Electronics Forum | Wed Apr 13 15:32:37 EDT 2005 | mmjm_1099
Don't know if this helps at all but here you go. I take care of documentation, smt programming, and bill of materials and notes. We have a smaller company so this is how we handle alot of the issues at hand. Our product traveler consists of what w
Electronics Forum | Thu Apr 14 06:00:01 EDT 2005 | bryan
The shelf life of immersion silver is 6 to 12 months in good storage conditions. The finish is usually coated with a protective layer that inhibits oxidation (like with copper OSP). Care must be taken when handling the boards as the protective la
Electronics Forum | Wed Apr 20 17:50:13 EDT 2005 | greg york
Try a rosin flux this has solved it for me on numerous occasions, no need to use heavy rosin only around 4% total solids so rosin around 1.5% is sufficient. It is down to the plasticizers which are tacky coming out of the resist. The rosin is an imme
