Electronics Forum | Wed Jan 30 17:48:31 EST 2002 | davef
Expanding on a previous poster's comments ... Vapor Phase Soldering. A solder reflow technology that uses a heated solvent to melt the solder. Buried deep in the recesses of the SMTnet Library is �Terms & Definitions�. We started using vapor phas
Electronics Forum | Wed Feb 20 19:57:27 EST 2002 | davef
THIEVING * Layout: I�d guess the surface area of your thieves is not large enough. The pull from the thief is not great enough to over-come the pull from the connector pins and pads. Consider tripling the size of the thief. As you say, reducing t
Electronics Forum | Mon Mar 04 17:52:59 EST 2002 | davef
Yes, providing the surface of the via is solderable. * If so, how much paste? => Vias come in various sizes. Boards vary in thickness. So, the amount of paste to fill a via varies. Roughly, you�ll need twice as much paste as the volume of the via
Electronics Forum | Wed Mar 27 21:20:30 EST 2002 | davef
There is two major BGA coating camps. * Camp #1: "We require the coating to be under low stand-off devices but with no filleting. So we apply a thinned dip coat first, and then top-off with a proper spray coat" * Camp #2: "We want no coating under th
Electronics Forum | Mon Apr 01 12:07:25 EST 2002 | slthomas
* What material are you using? Loctite 3609 * What is your cure profile? In excess of the 90-120 seconds at 150C that Loctite recommends. * Dot dimensions and tip? 27g. conical tipped needle for the 0603's. I started with a 14 mil dot which loo
Electronics Forum | Thu Apr 11 20:35:22 EDT 2002 | davef
Messy. Messy. Messy. Consider gluing these components, until you control your process. It is unclear to us that a single factor drives these defects, but multiple factors that need to be tuned to work well together. PAD DIMENSIONS * Some SM-782 pa
Electronics Forum | Tue Apr 16 13:59:33 EDT 2002 | paulausten
They work great as long as your conveyor speed > has been calibrated and checked on some type of > PM schedule. On some oven types these sensors can > warn you to possible problems with the conveyor > speed. Say the oven is calculating that the b
Electronics Forum | Tue Apr 30 07:49:38 EDT 2002 | johnw
shawn, define what you mean by solder ball's scattered across the board? I'd tend to agree with the thoughts of too much paste on chip's but normally your ball's would be mainly around these devices although som can move around depending on the surf
Electronics Forum | Wed Apr 24 21:25:46 EDT 2002 | davef
PROPER GROUNDING OF THE "OBJECT" PCBA BOARD: You cannot ground an insulator. Insulators accumulate a charge, but the charge must be neutralized, usually by ionization. We only use ionizers at tape stations and bins where travelers and other paper
Electronics Forum | Fri May 03 06:03:26 EDT 2002 | geoff_goring
Dave Many thanks for your very informative piece on SMT.com As we stand we have not yet 'seen' any problem. My issue is that we have ordered (LTB) a very large quantity of ASICS and our usage has taken a down-turn. We therefore need to keep the one
The SMTA membership is a network of professionals who build skills, share practical experience and develop solutions in electronic assembly technologies and related business operations.
Training Provider / Events Organizer / Association / Non-Profit
6600 City W Pkwy
Eden Prairie, MN USA
Phone: 952-920-7682
