Electronics Forum | Fri Dec 11 09:06:57 EST 1998 | Tom
| Has any body tried reflowing QFP's on both sides of a board. | GCollier Yes we do that quite often, we are using QFP132 with 0.5mm pitch in pure reflow process for both sides (no glue). It works well, the only problems we have seen was wiht compon
Electronics Forum | Thu Jun 20 17:40:03 EDT 2002 | pjc
Depends on which Assembleon machine, aye? The "GEM" line, Topaz & Emerald, stuff is Yamaha- Japan, which I consider more along the lines of Juki and i-Pulse (Tenyru/Yamaha), and maybe Samsung. The "Power" line, ACM & FCM, on the other hand is pure Du
Electronics Forum | Mon Nov 25 16:12:52 EST 2002 | russ
there is a good article by AIM solder regarding tin. In a nut shell, if you do not apply flux or heat to tin finish you will never degrade it! I agree with the others that you need to check the thickness of the pure tin layer. We have forbidden ti
Electronics Forum | Mon Dec 09 21:15:27 EST 2002 | MA/NY DDave
Hi I haven't looked yet at what DaveF gave you. It is my guess that your SJR stands for Solder Joint Reliability. The answer would in general be NO to your question. Usually things in the design community are done in steps that provide a certain
Electronics Forum | Fri Jun 20 09:38:56 EDT 2003 | caldon
Hi John- First, I do not have first hand experience so my input is pure theory. This type of package (in Some Cases) has a center grounding bonds and leadless legs ups the difficulty tremendously. With no stand-off from the Balls(or Legs) when the so
Electronics Forum | Thu Jun 26 09:04:43 EDT 2003 | caldon
We had a "Spring loaded" fixture that pulled the Flex tight and used loads of Board supports. There were pins that went through the Connectors holes and held the flex firm. We only had a few components so it was no problem. Lucky for us because the f
Electronics Forum | Tue Aug 05 08:58:45 EDT 2003 | caldon
Thanks for the update. I did just call Samsung and Mike Foster is indeed there but out on business trip. Seems you have all the scoop needed. As for the machine we had a pure laser vision (I guess you can call laser vision) and it was pretty good. I
Electronics Forum | Sat Oct 04 00:21:00 EDT 2003 | Dean
It would help to run a carbon, anion, cation, mixed-bed configuration with pure DI as the final rinse. IF your incomming water is really bad you can run a RO unit to "prepare" the water for ion exchange. Do you run omega meter or ionograph testing
Electronics Forum | Fri Jul 09 16:43:18 EDT 2004 | Sam
If pure speed is the main requirement then I would still not go with Turrent technolgy machines. The FCM from Assembleon (Now AX) is the fastest machine in the industry and consumes much less floor space then any Turret. Gantry machines such as Siem
Electronics Forum | Sat Jul 03 11:20:08 EDT 2004 | KEN
....not unique. But tough as hell! I build flex assemblies for a major P&P equipment manufacturer. Some are pure flex, most are ridgid flex. And of course, why put fiducials on the boards to help the process (why God, why me?) We use pallets and
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