Electronics Forum | Wed Dec 08 18:11:22 EST 1999 | Dave F
sin: You're correct, there is no defect reduction program that's perfect, in fact nothing is perfect!!!! That's why people talk about 6 sigma and not 20 sigma!!!! If you had a perfectly controlled process, you'd still have defects due to random va
Electronics Forum | Thu Aug 15 13:36:44 EDT 2002 | kenbliss
I would take the following method to start Which defect is taking the most labor time to fix. which defect is causing a bottleneck to your production. Fix the one causing the bottleneck first as it will improve your plant output and profits Then
Electronics Forum | Tue Jun 14 10:38:53 EDT 2005 | Stefan
500 rejected (?) per million placed components is a very good rate, considered that it would be better than 4 Sigma if you name it defects on the board. Or do I incorrectly convert ppm to dpm? * 3 Sigma 66,800 defects per one million opportuniti
Electronics Forum | Thu Dec 12 21:44:15 EST 2019 | davef
I don't know what a "mass defect" is. Defects are within AQL [acceptable quality levels] or they aren't. I start at General Inspection Level 2 in the AQL Chart ANSI/ASQ STANDARD Z1.4-2006 and a sampling plan ANSI/ASQ Z1.4 Adjust the Level for Budge
Electronics Forum | Wed Jan 17 11:21:29 EST 2007 | BillW
I have been using overall combined DPMO of SMT PCBAs as a performance metric. All defects are recorded down to component location and defect category. The resultant defect data table is analyzed with detailed pivot tables, defect type and defect loca
Electronics Forum | Mon Apr 25 11:24:31 EDT 2005 | Daan Terstegge
I have a question about inspection, touch-up, and how far you need to go to get a product that meets the required IPC-spec. According to some reports (i.e. "New Study Reveals Component Defect Levels" by Stig Oresjo of Agilent) the average defect leve
Electronics Forum | Mon Jul 27 13:54:25 EDT 1998 | Ted
| | | | I was wondering how successful industry has been in quantifying relationships between defects rates of particular solder problems (like bridging, opens,..) and PCA design parameters (like spacing, part orientation, pad dimensions, ...). For
Electronics Forum | Wed Jul 09 14:47:39 EDT 2014 | deanm
I'm looking for a typical SMT placement defect rate from others in the field so I can judge whether or not we are in an acceptable range. If I give you a board with 200 components (0603, 0805, SOICs, 20mil MSOPs, tantalums, DPAKs and a few 20mil fin
Electronics Forum | Fri May 05 11:11:05 EDT 2000 | Stefan Witte
The placement defect rate also depends on the shape of the components. 0402's have a higher defect rate than 0805's for example. If the board is very dense populated, chances are that a misplaced part knocks off another part and all of the sudden the
Electronics Forum | Sat Apr 18 09:32:08 EDT 1998 | Earl Moon
| What is cause and effect relationship for the Common defects in PCB manufacturing Can you be more specific? Do you mean PCB fab defects as they relate to assembly defects - or? Plus, there are so many cause and effect relationships it would take a
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