Electronics Forum | Mon Jul 02 18:40:33 EDT 2012 | joeherz
We used to have a Nuclean 324 that was running closed loop with a DI water recirc system. We also had problems with foaming that was solved with a relatively simple fix. We bypassed the final rinse solenoid so that it was always running. This allo
Electronics Forum | Mon Jul 16 12:19:00 EDT 2012 | jorge_quijano
Does anyone have experience with very large PCBs at Solder Paste inpection? our largest board is 32" x 22", it is a 0.250" thick and I was wondering if there is an Inline SPI for such dimensions. Currently I have a benchtop height measurement device
Electronics Forum | Wed Aug 15 19:55:46 EDT 2012 | hegemon
If you are doing X-Ray post place and pre-reflow you should be good. Look elsewhere. Check profile - full lead free or hybrid? Be sure you are acheiving the required reflow temps and TAL required for the solder paste too. Check for belt movement
Electronics Forum | Thu Oct 25 13:33:18 EDT 2012 | cyber_wolf
Ken, The photo looks like results I have seen because the gold flash was too thick on the board. This causes a condition known as gold imbrittlement. You may want to get an analysis of the plating thickness. I'm not real experienced with immersion si
Electronics Forum | Thu Oct 04 10:54:11 EDT 2012 | eniac
I have only one incredible idea: this is example of different speed of heat transfer of neighboring pads. I saw it two times during last years, but on lead solder pastes (Sn63Pb37). The reason of this mistakes each times we found two: 1. errors duri
Electronics Forum | Tue Dec 04 15:01:02 EST 2012 | davef
Here, the aim of using protective gloves in the SMT assembly area is to keep solder paste from operator hands for safety reasons. And sure, you make a good point, while you're trying to determine the correct material, it's a good idea that these glov
Electronics Forum | Tue Apr 02 13:43:54 EDT 2013 | ericrr
On one of the products uses a QFP (Quad Flat Package)which is not going on straight, maybe 20 pins per 4 sides. sometimes I have to tweak the alignment before the board goes in the oven, this practice can be a bit of a worry if you over tweak it - pa
Electronics Forum | Mon May 20 19:24:59 EDT 2013 | hegemon
Well, you wouldn't want 100 deg difference from zone to zone, in that you would likely exceed your maximum ramp rate, for instance if Zone 1 was 90C and zone 2 was 190C. Over time a general guideline (rule of thumb) has emerged, max about 40 deg dif
Electronics Forum | Fri Jul 12 22:15:56 EDT 2013 | ericrr
Sorry to build up your hopes. The latest thing to hit the air ways at work, I was accessed of fiddling with the oven settings, because there were reports of "cracked joints" there was no mention of where the cracks were, cracked at the pcb or cracke
Electronics Forum | Wed Nov 13 16:48:19 EST 2013 | spoiltforchoice
I would expect any half decent machine to place 0603 parts slap bang on target to the typical defined accuracy for such parts on most machines of perhaps ~60 microns or better. Self correction during reflow is IMHO much less pronounced with lead-free
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