Electronics Forum | Tue Apr 06 09:50:58 EDT 1999 | Justin Medernach
| Does anybody put QFP's on the backsides of boards? Can they be reflowed without falling off? Do you use adhesive? | I use a double sided reflow process all day, everyday. I've hung QFP240s with embedded heat sinks and they don't fall off. Yei
Electronics Forum | Tue Mar 30 13:40:30 EST 1999 | dennis warner
We've been using a newly installed DI re-circulating system. It's been a big headache. Mostly understanding what causes our resistivity to be unpredictable. I think I've got a handle on that part now. The system consists of a Carbon,HMR(chealet),Cati
Electronics Forum | Tue Mar 30 11:39:59 EST 1999 | Stefan Witte
| Hello, | | I'm a student assistant in a research project that deals with the simulation of PCB assembly systems. At the moment I collect information about SMDs. | My problem is how to assign the correct feeder width to various devices in a simulat
Electronics Forum | Wed Mar 24 19:26:25 EST 1999 | Marc Ruggiero
| Hi Folks, | This is my first surface mount board, so I asked our assembly house for some tips. They said only passives on the bottom side-preferably no smaller than 0805, 0603 only if I have to. I would think that an SOT-23 would be OK on the botto
Electronics Forum | Wed Mar 17 02:14:39 EST 1999 | Joe
| | We are having a small number (~2%) of our boards pass our manufacturing diagnostics, fail once they reach the customer, fail when they get back to us and then start working again after handling them for a short time. We have eliminated a lot of
Electronics Forum | Mon Mar 15 13:33:46 EST 1999 | Stefan Witte
| Is there anyone know where to get information on PIck & Place equipment Program optimisation ( to improve the speed of component placement for boards). Thank you | Program optimization usually includes set up optimization for the feeder table(s) a
Electronics Forum | Tue Mar 16 03:28:18 EST 1999 | Scott Davies
Al, In general, I would agree with Justin, i.e. contact printing with a 0.007" stencil is great for 0603 - 1206 size components. However, we also place 0.025" pitch QFP components. We use a 0.006" laser cut stencil and I have found through trial an
Electronics Forum | Fri Mar 12 18:12:15 EST 1999 | B. Walton
Spray cleaners are poor alternatives to todays ultrasonic stencil cleaners. Ultrasonics are the way to go and you can use rather benign water based chemistries to get the job done. As for screening adhesives and cleaning glue residue with spray wands
Electronics Forum | Sat Mar 06 12:33:21 EST 1999 | Dean
| | I'm having a fun time between BGA rework/repair using an SRT 1000 and SPC efforts (much easier) using DEK stencil printing processes and BTU reflow with 6 Fuji lines in between. | | Concerning the BGA stuff, I'm getting about 60% success using
Electronics Forum | Mon Mar 08 09:23:13 EST 1999 | Clifford Peaslee
| A recent thread ... | | Pre-heat for Ceramic Capacitors - Igmar 10:21:55 03/04/1999 | | ... was addressing something that was discussed in an earlier thread. I searched 'til I was ARRRRRRHHHH! without finding the earlier thread. The weird part
