Electronics Forum | Fri May 21 13:57:02 EDT 1999 | KA Stillings
| | hello...can somebody help me regarding the POPCORN at Reflow. What is this POPCORN at reflow, what it looks like, its cause and corrective action if there is... | | | | your help is greatly appreciated...thanks | | | | omat marasigan | | | |
Electronics Forum | Mon Aug 27 15:02:45 EDT 2001 | davef
It�s uncommon to test green strength. [Whatever �green strength� is. Some chip bonder adhesive suppliers have taken to taking about improvements in �green strength� their literature. We have asked sales types to quantify this and have never heard
Electronics Forum | Tue Oct 26 08:41:56 EDT 2004 | Bob R.
When we first got into BGAs on ENIG we were getting joint cracking at in-circuit test. The joints were breaking in the Sn-Ni intermetallic. We did a lot of pull testing while working with our board suppliers and our conclusion was that pull testing
Electronics Forum | Wed Jan 11 22:47:31 EST 2006 | davef
We didn't intend to light anyone's fur on fire [get anyone's underwear in a knot, roil the waters, have a cow man] about consultants. The Phil Zarrow wrote a useful paper that could help in evaluating paste. Here read it ... Evaluating Solder Paste
Electronics Forum | Thu May 26 08:52:42 EDT 2011 | davef
Phil Zarrow wrote a useful paper that could help in evaluating paste. Here read it ... Evaluating Solder Paste � Not An Option Contributed by Phil Zarrow of ITM an Independent SMT consulting firm With soldering being the dominant source of assembly
Electronics Forum | Mon Apr 01 19:57:07 EST 2002 | davef
Selective soldering machines are a good way to "finish automation", if the design of the PCB is conducive to the application with just a few components to solder. Your points are good. A decision matrix for selecting a machine might also include:
Electronics Forum | Thu May 27 16:23:12 EDT 2004 | davef
Process Trials Procedures. Standard trials are often conducted on reflow ovens by production engineers during product assessment, machine approval or in process set-up. The following trials are also used by machine suppliers during equipment develop
Electronics Forum | Tue Jun 26 19:59:08 EDT 2001 | davef
They always tell you to calculate ROI, when they want to blow you off. Do a net search using - calculate ROI. Links to three pretty good descriptions on this are: http://www.dmreview.com/editorial/dmreview/print_action.cfm?EdID=2487 http://www.eval
Electronics Forum | Thu Mar 19 12:13:16 EST 1998 | Justin Medernach
| Cpk's on top flight ovens (e.g., Conceptronics, Heller, Electrovert, Vitronics) vary wildly, from 1 to 2+, between different supplers. The suppliers don't seem to understand Cpk's. A supplier's rep whose oven has a Cpk of 1.0 told me: | 1. Cpk's
Electronics Forum | Thu Mar 19 12:37:15 EST 1998 | Earl Moon
| | Cpk's on top flight ovens (e.g., Conceptronics, Heller, Electrovert, Vitronics) vary wildly, from 1 to 2+, between different supplers. The suppliers don't seem to understand Cpk's. A supplier's rep whose oven has a Cpk of 1.0 told me: | | 1. C
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