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Process Capability - How much percentage of tolerance?


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  Post Number #1  
Old 10th July 2016, 12:03 AM
JAI GANESH

 
 
Total Posts: 1
Question Process Capability - How much percentage of tolerance?

In a automotive manufacturing process, to achieve 1.67 Cp, how much percentage of tolerance i must have to use. Can any one help me out??

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  Post Number #2  
Old 10th July 2016, 03:05 AM
KnoKsuKaO

 
 
Total Posts: 37
Re: Process Capability

Hello,
it's approx. 99,73%
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  Post Number #3  
Old 10th July 2016, 07:23 AM
Bev D's Avatar
Bev D

 
 
Total Posts: 3,442
Re: Process Capability - How much percentage of tolerance?

It's 60%. The inverse of the index gives the proportion of the tolerance 'consumed' by the process. If you look at the formula you will see that it is a measure of the tolerance divided by a measure of the process spread. So 1/1.67 = .6. Which is 60%

But remember the Xpk indices include the SD of the process AND the location of the process average in relation to the tolerances.
Thanks to Bev D for your informative Post and/or Attachment!
  Post Number #4  
Old 10th July 2016, 10:36 PM
Golfman25

 
 
Total Posts: 751
Re: Process Capability - How much percentage of tolerance?

Basically what be said. You can set your working limits at 60%. But it could be better or worse depending on your SD.
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