The Elsmar Cove Business Systems and Standards Discussion Forums Process Capability - How much percentage of tolerance?
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# Process Capability - How much percentage of tolerance?

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Post Number #1
10th July 2016, 12:03 AM
 JAI GANESH Total Posts: 1
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??

Post Number #2
10th July 2016, 03:05 AM
 KnoKsuKaO Total Posts: 37
Re: Process Capability

Hello,
it's approx. 99,73%
Post Number #3
10th July 2016, 07:23 AM
 Bev D Total Posts: 3,517
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
10th July 2016, 10:36 PM
 Golfman25 Total Posts: 834
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.

 The Elsmar Cove Business Systems and Standards Discussion Forums Process Capability - How much percentage of tolerance?

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