Electronics Forum | Thu Aug 12 11:00:42 EDT 2010 | hegemon
Without seeing a picture, my first instinct would be first and foremost some fixturing that provides full support for your print process. After that, since you are citing bow and twist, consider that the fixturing might as well travel through the ov
Electronics Forum | Wed Apr 23 19:00:39 EDT 2008 | stevek
It depends on the laminate but a PWB is like any other MSL component. Some fab shops are only waranting standard FR4 laminates for 45-60 days when processed at lead free temperatures. The best thing I can say is to try some weight gain/loss experim
Electronics Forum | Mon Aug 27 12:31:04 EDT 2012 | rway
Its no my turn to give some advise. My first > question would be can you put the boards into a > carrier of some sort. There are many wonderful > companies that make carriers that are ment for > running down a smt line. This can be expensive > u
Electronics Forum | Mon Aug 27 11:51:47 EDT 2012 | cobham1
Its no my turn to give some advise. My first question would be can you put the boards into a carrier of some sort. There are many wonderful companies that make carriers that are ment for running down a smt line. This can be expensive unless you order
Electronics Forum | Mon Jan 26 11:58:06 EST 2009 | ghcarnu
Hi there, where can I find some hints about placing the temperature sensors on the pcb when determining the reflow profile? I'm interested especially in the case of a pcb having BGA's. Thanks for your answers ! gheorghe
Electronics Forum | Wed Jan 28 08:56:40 EST 2009 | blnorman
Don't know the specifics from the IPC spec. However our standard internal spec dictates - highest thermal mass, lowest thermal, most critical component, and center of PCB on the laminate surface. Our profilers have 6 inputs, so the other 2 are dete
Electronics Forum | Thu Oct 11 17:44:30 EDT 2001 | aaelect
OK, OK. 672 ball BGA. The pcbs are PC Card bus size and are .015 thick. There are 3 on a panel with about 1/2" between and rails. The aluminum plates are about 3" by 7". There are 3 cutouts which allow for the parts from either side to protrude du
Electronics Forum | Mon Jan 26 22:32:05 EST 2009 | davef
Check Daan Terstegge's excellent jump site for articles on profiling http://www.smtinfo.net/Db/_Thermal%20Profiling.html
Electronics Forum | Mon Jan 26 15:09:59 EST 2009 | leemeyer
IPC 7530 - Guidelines for Temperature Profiling for Mass Soldering Processes (Reflow & Wave)
Electronics Forum | Mon Jul 01 09:33:08 EDT 2019 | dbuschel
if you can't change the PCB materials or design at this point, you might be able to reduce it somewhat through the use of fixtures or edge stiffeners. Unless it is a particularly thick board, I don't think the reflow profile would be the issue. The t
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