Electronics Forum | Fri Jun 07 14:05:39 EDT 2024 | davidk
I wanted to open a discussion and ask about opinion: What is a normal result of the inspection of an AOI? How many falls calls per component /opportunity is bad/normal/good? How many defects per component/opportunity is bad/normal/good? What is goo
Electronics Forum | Thu May 04 23:00:52 EDT 2000 | gary
SMT Placement ppm = # of defects*1E6 /(Qty boards * number of components per board) is the above ppm formula for placement defect correct? How about in your company? what method you are using? We are planning to implement SPC on our SMT Lines, any i
Electronics Forum | Wed Aug 21 18:11:47 EDT 2002 | dragonslayr
..and the choir is humming in 5 part harmonies. Personnally, I never gave much truck to Cpk stuff. Seems to be a high falutin way of showing the lowerlings that academics can manipulate numbers. Dazzle 'em with brilliance or baffle 'em with bull puke
Electronics Forum | Wed Jul 02 19:10:45 EDT 2008 | arminski
Hi, Say I'm going to calculate my PPM and DPMO, do I have to include in my defects data an item that the root cause is already identified? example is if I have 4 components with Land Design issues (incorrect dimension) and is causing me insufficient
Electronics Forum | Wed Jul 23 12:01:28 EDT 2008 | Jdd
Can anybody know the acceptable PPM (part per million) on AOI machines on Low volume-high mix also on High volume-Low mix. We are a Low volume-high mix company, we have Agilent SJ50 Series 3 machines Can anybody have the idea how many PPM are good
Electronics Forum | Tue Oct 20 06:46:26 EDT 2009 | davef
A couple ideas are: * Search the fine SMTnet Archives. Use search terms such as: ppm or dpmo or *7912 or *9261 * Bob Willis runs a PPM Monitoring project that compiles data from industry. Look here: http://www.bobwillis.co.uk/ppm/asp/Monthly.asp We
Electronics Forum | Fri Aug 26 21:23:38 EDT 2005 | Jes�s Salinas
Hello , In our case we take the results from the repair station. Each test station has its own repair station so from there we count the process defects : placement and printing. The formula used to calculate PPM = DEFECTS / (PARTS PER BOARD x UNITS
Electronics Forum | Thu Jul 03 08:53:27 EDT 2008 | rgduval
I would...and then use the data of the known issues as part of the secondary analysis. The defect is a defect, one way or the other. You can use the secondary analysis of your PPM numbers to continue to drill down in the process. If your overall P
Electronics Forum | Wed Feb 16 12:57:54 EST 2000 | Claude Couture
Hi! We currently have less than 200ppm after reflow. Our products have practically no fine pitch, so it's easier to reach a low ppm.
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