Discussions Populaires Dans la Communauté SPC

How to measure Process capabilitiy (Cp/CpK) for non-normal distribution?‎

The formulae widely used is based on Normal distributiion curve. But, we have seen processes which are completely different in terms of distribution. In those cases, how ‎ ... Voir Plus

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In machining processes, for geometrical parameters what should be the Cpk/Ppk requirement?‎

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How many points do you need to define for the rectangular command?‎

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How many years of data do you have available?‎

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What is the meaning if you find that the cp or cpk value less than 1 ?‎

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Did we achieve or get CPk, PPk or Cmk value for unilateral tolerances? If yes please explain. ‎

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La répondre a été ajoutée par  Abdelkrim TRABELSI, Ingénieur Projet, Zodiac
Depuis 10 années

How is process capability (Cp, Cpk) estimated for non-normal data?     First, we should discuss some general requirements for Process Capability Indices (Cp, Cpk) 1. You ... Voir Plus

 

La répondre a été ajoutée par  Harikiran Rao, MARKETING RESEARCH, AT LINK PHARMA PVT. LTD
Depuis 10 années

Process Capability enables you evaluate non-normal process capability using:  Box-Cox power Transformation  Johnson Transformation system  Clements Method using Pearson C ... Voir Plus

 

La répondre a été ajoutée par  Ahmad Khreasat, Risk and Quality Officer, Royal Scientific Society - Policies & Risk Dept.
Depuis 10 années

Actually you can't use Cp and Cpk on non-normal distribution. the forrmula is based on the assumption that the distribution is normal. thats why when we explain proc ... Voir Plus

 

La répondre a été ajoutée par  pankaj Chaudhary, Quality Control Engineer, Jbm auto
Depuis 5 années

SPC is a widely used quality tool throughout many industries. ... By monitoring and controlling a process, we can assure that it operates at its fullest potential. ... da ... Voir Plus