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This thread is carried over and continued in the Current Elsmar Cove Forums 
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This thread is carried over and continued in the Current Elsmar Cove Forums
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The New Elsmar Cove Forums
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 The New Elsmar Cove Forums
 Statistical Techniques and 6 Sigma
 R & R calculations
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| Author | Topic: R & R calculations |
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chuy sanchez Forum Contributor Posts: 14 |
posted 23 March 2000 05:17 PM
   
A friend just told me that a new tecnique to calculate r&r involving 6 sigma ( no from g.e.concept) so, somebody hear about that ? Only that i know is when you relations is with RTT( total Spec ). thanks IP: Logged |
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Marc Smith Cheech Wizard Posts: 4119 |
posted 31 March 2000 11:23 AM
I''m not an R&R expert. Maybe one of the other folks can pick up on this. IP: Logged |
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Don Winton Forum Contributor Posts: 498 |
posted 31 March 2000 11:51 AM
I have not heard anything "new" regarding R&R either. IP: Logged |
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Batman Forum Contributor Posts: 111 |
posted 08 April 2000 05:50 PM
I am not a statistamagician, but on occasion I have used a 6 sigma vs total tolerance when using a CMM or similar instrument and only needed the "R" repeatability part of the Gage error. I take one part and measure it 20 times (not sure how significant THAT value is - 15 may be enough) and calculate the 6 sigma of those values. Theoretically, this give the error of the measurement device, which is then compared to the total tolerance. I don't recall reading this anywhere, but no one ever complained. IP: Logged |
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chuy sanchez Forum Contributor Posts: 14 |
posted 09 April 2000 04:46 PM
yeahhhhhh, thanks I just talk with a friend statical man and he give the same aswer that you batman. The only issue is : if you use a gage for SPC chart you should be use a 6 sigma, if not use the regular calculation. For what ? only the impact the readings and more exacly which error is permissible on this instrument. thanks IP: Logged |
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Batman Forum Contributor Posts: 111 |
posted 18 April 2000 10:55 AM
Not sure of your question, Chuy, but when you perform a GR&R, you are qualifying the gage to either accept readings from it or not. SPC is separate from GR&R in that, given the gage is acceptable, the actual readings from the process are charted, and any other [correct] data analysis is accepted since the data were collected and accepted by an acceptable gage. IP: Logged |
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