Electronics Forum | Sun Nov 19 22:21:37 EST 2006 | KEN
When you say "SMD" I am assuming you are refering to a component. But in your description you mention these are some type of "boards". "flatness" or coplanarity is a function of the application and process. I think in your case your standards wo
Electronics Forum | Mon Nov 20 19:49:03 EST 2006 | davef
Sorry for stating this incorrectly. It should been: Bow & twist for bare boards and panels: IPC-A-610 Acceptability of Electronic Assemblies, 10.6: 1.5% for PTH only and 0.75% for SMT, acording to test method TM-650, method 2.4.22 IPC-6012, par. 3.
Electronics Forum | Fri Nov 17 15:04:59 EST 2006 | ehess
WE have a problem with a DPAK component floating during reflow, causing it to move to the point where it affects the toe fillet. We have been using a dot of SMT epoxy to hold it secure for the moment. I have looked on many sites, but no whrere can
Electronics Forum | Mon Nov 20 16:40:16 EST 2006 | FredC
I stock nozzles that I made for this machine, but it has been a couple of years since I sold one. Even in the machines heyday we never sold more than a couple hundred nozzles at a time. One customer that has long since closed told me about an inciden
Electronics Forum | Tue Nov 21 12:04:52 EST 2006 | Rob
From what I remember it was kind of obsolete before it started as the CP6 came along shortly afterwards & we all know how great they still are. It didn't offer much more than the CP4's so it was kind of squeezed out. I do remember hearing of one
Electronics Forum | Tue Nov 21 09:46:19 EST 2006 | jax
I assume you are talking about Sn62Pb36Ag2 solder. You should not see any added concerns when subjecting Sn62 to multiple reflow cycles as compared to Sn63. As compared to Sn63Pb37: Reduced leaching issues Increased Wetting due to lo
Electronics Forum | Tue Nov 21 13:25:25 EST 2006 | jax
Depending on Zone Temperatures, Belt Speed, and Board Density... Some Convection Ovens will drop Zone Temperatures faster than others. They recover by increasing Air Circulation. This can make parts fall off the Bottom-Side that otherwise would
Electronics Forum | Tue Nov 21 13:38:10 EST 2006 | billwestiet
I'll also make the same reccomendation, I always make. Call the OEM. Vitronics tech support is pretty good, and they should help you out. I don't think the blowers turn on and off as suggested earlier, but I do think they have multiple speeds than
Electronics Forum | Tue Nov 21 20:21:11 EST 2006 | billwestiet
Most machines for lead free have adjustable conveyor angles (4 to 8 degrees). In the good ole days with lead, we typically ran at about 6 degrees. Often we see closer to 4 degrees with lead free. This is very common, and provides longer immersion
Electronics Forum | Mon Nov 27 16:19:14 EST 2006 | greg york
Sorry Bill We have filled and supported over 250 Lead free machines now and have actually moved the angle back to 7 degrees the same as Leaded and the bridging problems have gone away.Dwell times are only fractionally longer and results are very goo
