Electronics Forum | Wed May 21 12:55:35 EDT 2003 | Zhenya
Several things for your reference: 1. Starting with data collection: - Have you done a measle chart to illustrate the pattern of the defect? - Have you checked the corelation between shift/time and defects rate? - How about a pareto chart? - Do
Electronics Forum | Mon Dec 03 14:53:54 EST 2007 | jmelson
Well, it mostly does. The explanation and how-to-fix fields of the error chart do contain some howlingly bad translations. But, the how to fix field said the management info needed to be cleared. Once I understood they meant the MIS statistical dat
Electronics Forum | Thu Feb 14 11:04:41 EST 2019 | SMTA-Bob
Bob Willis Book Reviews for Electronic Assembly https://youtu.be/IkQFFT4DT5U Three new books this month, hopefully there is something that will have you visiting the book shop or online service soon like http://www.smta.org Nanopackaging Nanotech
Electronics Forum | Mon May 14 08:41:11 EDT 2001 | jackofalltrades
Howdy, This subject may be a little off subject, but I have been looking for a source that can give me info for the recommended torque on hardware. What I would love to see, is a chart that can show me, for example a column for the screw size (SAE &
Electronics Forum | Thu Jun 14 14:01:11 EDT 2001 | Claude_Couture
I used to associate the mass of the assembly with the reflow profile. The greater the mass, the greater the quantity of heat you need to give the assembly. Most of the time you just need to reduce the speed of travel in the oven. Try different settin
Electronics Forum | Tue Dec 21 13:27:47 EST 1999 | Vince Whipple
Charlie: As far as setting up a spray fluxer.. Are you spraying no-clean, voc free, water soluble? What you would want to do is to run a blank pcb through the fluxer and pop it out before the preheaters. Visually inspect for variations in uniformit
Electronics Forum | Mon Mar 11 11:11:38 EST 2002 | slthomas
Tahnk you for posting the charts. > > They look > very useful, but I have a silly question: In > reflow problems _ What is "leaching" ? Dissolution of the component metallisation into the liquid solder. _ > What is "Halo effect" ? "...a
Electronics Forum | Wed Mar 20 19:53:11 EST 2002 | davef
Your customer's question is reasonable. Before you can establish your control limits, you need to take 25 to 30 data samples of 4 to 5 measurements. This says you need a 100 or more measurements before you can start charting. And even this much
Electronics Forum | Fri Jan 24 09:26:29 EST 2003 | pjc
I sent you a couple of charts to assist with your troubleshooting. One is the Electrovert Wave Solder Troubleshooting chart and the other is Sandia Labs/Electrovert Optimum Solder Contact Time. Electrovert has a 6 deg. conveyor angle standard on the
Electronics Forum | Fri Jul 15 03:29:52 EDT 2005 | dougs
thomas, why isn't it process control, you cant just think that because you've set up your machine properly ( pot temp, wave height, pre-heat etc etc )that everything is going to be ok, there are other factors that you wont find with wave riders or
