Electronics Forum | Thu Feb 22 16:40:23 EST 2007 | mika
One of our customers that always was going for Ni/Au surface finish on RoHS PCB and our processs was adjusted for that, "whithout any problem". Recently they decided to switch to another surface finsh: PbFree HASL. What is that? Imersion tin/silver?
Electronics Forum | Tue Feb 27 11:03:09 EST 2007 | Marcin
Hi All, Anybody knows what is the minimum clearance between through hole component and chip component? Problem description: On bottom side of my pcb are only 0603 chip components mounted on glue. One of the component is located very close to hole
Electronics Forum | Thu Mar 01 22:21:06 EST 2007 | davef
From our notes ... An intense evaluation was completed in 1992 that involved testing of three board types [6 layer FR4, 6 layer ceramic copper thick film, and a 4 layer copper-invar-copper board] by the Navy Surface Warfare Center, Crane, IN. [Obvio
Electronics Forum | Wed Mar 14 07:30:14 EDT 2007 | davef
So, you toss whatever is on the stencil every 8 hours. Correct? How long has it been on the stencil? * If that particular paste has been on the stencil for 8 hours, we'd agree to toss it too. * If paste has been on the stencil for less than 8 hour
Electronics Forum | Tue Mar 13 06:50:57 EDT 2007 | realchunks
Hi Narksh, Well, for a quick over view, I'd suggest conveyors between all your equipment too. Also board handling equipment like bare board loader, buffers, shuttles... It really depends on how focused you want to get. When choosing any part of
Electronics Forum | Thu Mar 15 17:33:20 EDT 2007 | Darby
As you are new to this - start with lots of hair and slowly reduce. Start with one good person. Spend the money on someone who knows the process, can set it all up, (including air, power, alignment, calibration, programming, troubleshooting, stenc
Electronics Forum | Wed Apr 04 19:10:20 EDT 2007 | rgduval
Pete, Top-side temp might be an issue. What's the easiest way to check it? I seem to recall some thermal decals that we used to use a couple of jobs ago. I spoke with the flex manufacturer, and they recommended 4 hours at 250 degrees pre-process
Electronics Forum | Wed Apr 04 19:27:07 EDT 2007 | davef
The easiest, long term cheapest, and most accurate way to measure top-side temperature is to use one like: * http://www.amazon.com/Fluke-62-Mini-Infrared-Thermometer/dp/B000MX5Y9C/ref=pd_sbs_auto_2/102-7460227-1828165 * http://www.amazon.com/gp/prod
Electronics Forum | Wed May 02 10:37:59 EDT 2007 | DG
We have 4 EVS machines in our facility. The operators like them, maintenance doesn't. The PM's aren't that bad it just that maintenance doesn't like doing them. On a few of the earlier machines we have if the operators are not careful they can get mo
Electronics Forum | Thu May 31 10:52:31 EDT 2007 | patrickbruneel
A solder wire classified as L0 under IPC J-STD-004 means that the flux residues can be left on the board safely, and when you select this type of cored wire the intention is not to clean. You just select a solder wire that gives you an acceptable lev
