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  Statistical Techniques and 6 Sigma
  R & R calculations

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Author Topic:   R & R calculations
chuy sanchez
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Posts: 14
From:Saltillo, Coahuila, Mexico
Registered: Nov 1999

posted 23 March 2000 05:17 PM     Click Here to See the Profile for chuy sanchez   Click Here to Email chuy sanchez     Edit/Delete Message   Reply w/Quote
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

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Marc Smith
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From:West Chester, OH, USA
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posted 31 March 2000 11:23 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
I''m not an R&R expert. Maybe one of the other folks can pick up on this.

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Don Winton
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posted 31 March 2000 11:51 AM     Click Here to See the Profile for Don Winton   Click Here to Email Don Winton     Edit/Delete Message   Reply w/Quote
I have not heard anything "new" regarding R&R either.

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Batman
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From:Kane, PA 16735
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posted 08 April 2000 05:50 PM     Click Here to See the Profile for Batman   Click Here to Email Batman     Edit/Delete Message   Reply w/Quote
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.

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chuy sanchez
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Posts: 14
From:Saltillo, Coahuila, Mexico
Registered: Nov 1999

posted 09 April 2000 04:46 PM     Click Here to See the Profile for chuy sanchez   Click Here to Email chuy sanchez     Edit/Delete Message   Reply w/Quote
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

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Batman
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From:Kane, PA 16735
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posted 18 April 2000 10:55 AM     Click Here to See the Profile for Batman   Click Here to Email Batman     Edit/Delete Message   Reply w/Quote
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.

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