## Electronics Forum: sigma (Page 1 of 20)

### Accuracy of placement +/-100um @ 5 sigma

Electronics Forum | Mon Nov 24 02:48:33 EST 2003 | Process Engineer

I am not sure where Frank got his numbers but here is what Sigma really means. 1 Sigma is one Standard Deviation, 2 Sigma is two Standard Deviations...(anyone take a Stats class in college?) I am not going to bore you with all the stat-mumbo-gumbo

### Accuracy of placement +/-100um @ 5 sigma

Electronics Forum | Fri Nov 21 14:10:07 EST 2003 | Vincent

Thanks for your reply. I'm wondering if We have 2 machines, one can do +/-100um @ 3sigma and the other is +/-100 @ 4sigma. And how U come up the solution. thanks

### Accuracy of placement +/-100um @ 5 sigma

Electronics Forum | Fri Nov 21 14:10:21 EST 2003 | Vincent

Thanks for your reply. I'm wondering if We have 2 machines, one can do +/-100um @ 3sigma and the other is +/-100 @ 4sigma. And how U come up the solution. thanks

### Share info for Six sigma - BB

Electronics Forum | Fri Mar 02 09:50:04 EST 2001 | stefwitt

Dave, I did assume Angela meant components ready for pick up. It would be too time consuming for any machine to measure the component availability prior to pick up. If we assume that the feeder advances in a rate of six sigma ( 3 defects per mio ) t

### Share info for Six sigma - BB

Electronics Forum | Wed Feb 28 19:59:43 EST 2001 | davef

Wowzer, there's tons of hits on the net for "six sigma BB". Six sigma stuff gives about one tenth the hits of "Total Quality Management". Hummm. They give these five day training courses on histograms, parento charts, and whatnot to get a BB. Co

### Accuracy of placement +/-100um @ 5 sigma

Electronics Forum | Thu Nov 20 12:10:20 EST 2003 | frank

Well, let me take a shot... +/-100um = 0.1mm 5 sigma = is the number of acceptable defects (or placements outside of that accuracy (or tolerance). I believe 5 sigma is 233 defects out of 1 million, but I could be wrong on that. So basically all pl

### Accuracy of placement +/-100um @ 5 sigma

Electronics Forum | Mon Dec 01 12:33:20 EST 2003 | frank

I see where I went wrong. The numbers provided by "Process Engineer" are correct. My company is trying to adhere to the Six Sigma code of business and the managament here falsely assumed that all of our equipment can do that as well. After doubl

### Share info for Six sigma - BB

Electronics Forum | Wed Feb 28 10:51:40 EST 2001 | slthomas

Almost has to be Black Belt, doesn't it?

### Share info for Six sigma - BB

Electronics Forum | Wed Feb 28 18:51:21 EST 2001 | mparker

It's obviously Bertha - the only one of the Butts sisters that was a standard 3 deviate

### Share info for Six sigma - BB

Electronics Forum | Fri Mar 02 09:22:51 EST 2001 | davef

How does the HS50 measure "pickup availability"?

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#### sigma searches for Companies, Equipment, Machines, Suppliers & Information

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