Electronics Forum | Fri Feb 15 06:21:34 EST 2008 | marjorie
Thanks for the comments and advice. The rest of the components have good solderability except for the BGA that fell off. Our production is high mix low volume so the quantity was very small. I'll check the pcb lands next time I run. It could be a con
Electronics Forum | Fri Feb 15 17:50:30 EST 2008 | stevek
Creating a sound tin nickel intermetalic takes a bit more energy than other finishes (such as copper or tin). You can achieve wetting, but not have a viable intermetalic. You should cross section some intact boards from that process and see what th
Electronics Forum | Mon Feb 18 02:08:06 EST 2008 | lococost
4 days seems a lot. You could be losing flux activation causing poor wetting on the enig. Check your suppliers data sheets for paste life. If it was contamination on the PCB, you'ld expect other components to solder badly as well. Try using a bra
Electronics Forum | Thu Feb 21 06:31:20 EST 2008 | gregoryyork
We treat all our alloys with measured Phos additions. SAC alloys treated with Phos WILL/DO dross approximately half the amount of 63/37. Most Solder companies will not tell you this as they wish you to use more Solder. We are a Nitrogen Cast Solder p
Electronics Forum | Fri Feb 15 07:19:22 EST 2008 | floydf
Currently when we get a new screen, we inspect it by holding a pcb or artwork under it and confirming that there are pads underneath all of the holes. The flaw with this approach is that if there are pads on the board with no corresponding hole in th
Electronics Forum | Fri Feb 15 11:23:44 EST 2008 | realchunks
Print material through stencil onto Plexi-glass and place Plexi onto your board. Sure, it may cause a little clean up but this where the metal meets the meat. Don't worry about ESD cause you have no component on the board yet (sorry Quality guys -
Electronics Forum | Wed Feb 20 15:00:12 EST 2008 | mulder0990
Reading the original post.. Floyd, do you remember the old overhead projectors back before we had the new fancy video projectors? Just get a clear sheet of that plastic and print your outline on that. Put that sheet over the stencil and presto, you
Electronics Forum | Wed Feb 20 19:59:10 EST 2008 | pnguyvu
An experienced stencil designer suppose to check gerber data before making stencil it take 5 minutes to do this easily in computer after that analyze components if there's any critical parts in order to modify the aperture at USA STENCILS INC we have
Electronics Forum | Mon Feb 18 08:56:44 EST 2008 | operator
It does exist. We used to have one here, but sold it. It was more of a manual process though. You put the assembled board on the work table and then set your cutting blade height. Then you manually moved the cutting blade around shearing off the TH l
Electronics Forum | Tue Feb 19 14:52:04 EST 2008 | dphilbrick
You also need to understand when using something like a Q Cutter you should resolder the board after you cut! Your alternative is to get someting that when you put your part in it cuts and clinces the part. Contact Systems makes machines that present
