Electronics Forum | Wed Mar 14 09:07:34 EST 2001 | blnorman
We just ran a study to try to determine this. We exposed the paste to 85% humidity to simulate worst case manufacturing. At various times we removed the paste from the chamber and tested it for tack, solder balling, wetting (copper coupon), and vis
Electronics Forum | Thu Jul 20 13:08:35 EDT 2000 | Bob Willis
The solder paste formulation is different 63/37 is a tin lead alloy so t here is one difference from a lead free. Yes you can get no clean lead free products but if you compare the amount of visible residues they will be normally higher. So far most
Electronics Forum | Tue Oct 30 14:39:41 EST 2001 | markhoch
Has anybody else out there had problems with SMT connectors with plastic locating pins lifting up during the reflow process? We've had several instances with several differant types of SMT connectors lifting up during the reflow process. We've even g
Electronics Forum | Mon Aug 19 20:45:31 EDT 2002 | davef
Bob Willis and Phil Zarrow have had a running commentary on the ability of reflowed solder to hold components on the bottom side during reflow. You can find references to their component weight to pad area rations in the fine SMTnet Archives. The
Electronics Forum | Fri Aug 30 16:35:05 EDT 2002 | davef
Oooo, I get it. Sorry I am so dense. So, as Johnny Cochran might say, your pads are so slick that the paste won�t stick. So, either: * Someone is slimming your boards with goop that prevents the paste from sticking on the pads. Some plastic bag h
Electronics Forum | Mon Sep 02 11:52:51 EDT 2002 | davef
We looked at RFID labels for finished assembly tacking. Most of the applications of RFID are used to prevent inventory shrinkage of expensive clothing. Although, increasingly companies are using RFID in security applications. The ISO 15693 standar
Electronics Forum | Mon Dec 02 15:56:40 EST 2002 | russ
For CYA reasons you made the right choice (I agree with Mark). But, for whatever it is worth I have used Loctite 383 up to 4 years past it's shelf life It worked fine for my application (wire tacking, FR4 bonding etc...). Have you ever seen a shelf
Electronics Forum | Wed May 07 20:55:35 EDT 2003 | davef
Bollocks!!!! We are unfamiliar with the term overturn, but it can not be that uncommon. Our intial inclination is to barrel into this SMT Engineer's nap-zone and blast him, but it might not be a politic approach. So, maybe we'll temper the tack we
Electronics Forum | Fri Mar 05 19:17:00 EST 2004 | Ken
I have had OSHA strap accumulative "sniffers" onto wave operators and maint. tech's. THe sniffers collect air bound particulates and trap them into a filter. Later the filter is analyzed and an operator exposure rate is determined. They also will la
Electronics Forum | Thu Dec 08 11:50:40 EST 2005 | Stefan
If you mention mis-alignment and missing component in the same sentance, I suspect the component is not properly released after placement. Assuming the Juki machines use an air blow, after vacuum shut off, than I would look at a correct air flow firs
