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

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تم إضافة السؤال من قبل Shaikh Tanveer , Deputy Manager , Mahindra & Mahindra
تاريخ النشر: 2016/03/12
Praveen Nathan
من قبل Praveen Nathan , Senior Engineer , Roots industries India Pvt Ltd

Ppk = 1.67 Short term capablity 

Cpk = 1.33 Long term capablity

Rajeshkanann devar
من قبل Rajeshkanann devar , Production engg , doiter casting

 in line production that required cpk>=1.67,ppk>=1.37

David Wiseman
من قبل David Wiseman , Senior Quality Control and Continuous Improvement Engineer , BAE Systems, Maritime Services

Cp/Cpk represents short-term process quality where for a process to be JUST capable then Cp MUST BE >1, If Cp=Cpk then the process is centred BUT due to process drift then for a process to be sonsistently capable then Cp must to much greater than 1 (for example between 1.6 to (ideally 2). So if Cp = 2 and Cp=Cpk the process is centred and is very capable. Pp/Ppk measures similar parameters to Cp/Cpk but is longer term process capablity.

Rameez Ahemed Bidi
من قبل Rameez Ahemed Bidi , Logistics Coordinator , Mashhor Group Of Companies

Equal to or more than 1.33

Joannalyn Gulle
من قبل Joannalyn Gulle , New Product Introduction Engineer , Cebu Mitsumi Inc.

In machining process, Cpk requirement should be equal or more than 1.33.

vijay raj
من قبل vijay raj , Senior Engineer , BOSCH LIMITED, Gasoline System

According to AIAG , CpK >1.33 and Ppk > 1.67

ABHINAV VYAS
من قبل ABHINAV VYAS , SUPPLIER QUALITY ENGINEER , TATA MOTORS LTD.

1. FOR PPK IT SHOULD BE MORE THAN 1.67

2. FOR CPK IT SHOULD BE MORE THAN 1.33

Afzal Ahammed
من قبل Afzal Ahammed , Quality Assurance Officer , T,V,S Sundaram Auto Components ltd

Should be lesser ot greter than 1.66

Faheem Ahmad
من قبل Faheem Ahmad , Quality Assurance , Devchhaya Industries, Uttarakhand

In machining process, the value of Cpk should be between 1.67 to 2 and will always smaller than value of Cp 

ALEEM S.M. Shaik Musthafa
من قبل ALEEM S.M. Shaik Musthafa , Senior Engineer - Responsible for Daimler and AL Nissan Product quality , Myunghwa Automotive India Pvt Ltd

During machining process, Cpk ad ppk should have more than or equal to the 1.66 value required to the geometric dimensions

Vaibhav Gadhawe
من قبل Vaibhav Gadhawe , Senior Consultant & Corporate Trainer , Omnex India Pvt Ltd

n machining processes, for geometrical parameters Cpk/Ppk should be more than or equal to 1.67.

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