Electronics Forum | Mon Oct 15 09:58:27 EDT 2007 | davef
Never heard of "special finger marker stickers" for checking wave parallelism. We assume that you're talking board-to-wave parallelism. We use a Durostone fixture with a thermalcouple [TC] in each far corner of the fixture (flush to the bottom of th
Electronics Forum | Fri Nov 09 08:45:31 EST 2007 | philkaz
I am in the R&D department at KIC. We have been making thermal profiling equipment for 20+ years. A standard circuit board is made from FR4 fiberglass. A typical solder reflow profile, whether leaded or unleaded, takes the board above the "glass t
Electronics Forum | Fri Dec 21 15:50:54 EST 2007 | rwyman
Hi smtdude- I'm no expert at PoP (yet!) as we've only done a few weeks worth of experiments for a new customer but what i can tell you is 25-50% of the ball height (not diameter) is a good rule of thumb for the flux depth, at least to start. I can s
Electronics Forum | Wed Dec 19 18:41:33 EST 2007 | darby
You printer is not solely designed for printing solder paste. This is why some of the options you would never use for paste appear in the menu. You may actually be printing overlays or yes, even t-shirts. This is why you may want to flood/print, prin
Electronics Forum | Tue Jan 15 16:44:54 EST 2008 | gregoryyork
I found some machine manufacturers put convection nozzles in line parallel with each other instead of staggering them so you get a nice parallel line up the board where there is no flux be it no residue alcohol or VOC Free. The best I could find was
Electronics Forum | Wed Jan 23 15:13:54 EST 2008 | tbkonrad
It's not the z pickup or profile bot thanks for the help, I think Mike is right. I have used these profiles hundreds if not thousands of times in the past and never had an issue. Also it was different components and different profiles almost every ti
Electronics Forum | Wed Mar 12 13:41:23 EDT 2008 | swag
We have a lead free assembly with a 128-Pin PQFP with 20 mil pitch leads. We have tried stencil aperture reductions, step-down stencils, different thickness stencils, various printer setting changes, placement pressure changes, nozzle changes, moved
Electronics Forum | Wed Apr 16 11:29:31 EDT 2008 | mmjm_1099
Per Tony SMT Here are more photos: Q15, Q16, Q17 represent good transistors on a 1 up board with the transistor locations that are in question. Q13 is a good transistor on a bad 2up board. Right next to it is Q14 a bad transistor on a bad 2 up boa
Electronics Forum | Tue May 20 09:34:28 EDT 2008 | roc2x
Well something is different isn't it? * Paste * > Part supplier * Board fabrication * Was the > profile that you reference the measured > temperature or the the settings keyed into the > oven? > > The cross sections seem to show less > than exp
Electronics Forum | Thu May 29 14:57:26 EDT 2008 | rodrigo
Hi all, Is it normal for some of the small nozzles to be rejected by the wide view camera? Every time I do a nozzle centering the narrow view camera shows green circles for nozzles 1,2,3,4. The larger ones (5 and 6) show the asterisk. The wide view c
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