How to calculate Cp & Cpk values

[MindPower]

Hi All,

Can anybody help me in understanding the process behind Cp & Cpk value calculations.I am working on an application wherin I need to capture data coming continously due to scanning done by laser beam on any product  (this optics energy gets converted into digital data) and I need to calculate the Cp &  Cpk values.If my data is within tolerance limits , I get Cp & Cpk values as infinite (most of the times) or any positive number say 12/24.78/3000/ anything and if my data is out of tolerance limit , it  comes as -0.03 etc..

However , the standard values are >2 and 1.33 .

Please tell me the proper way of capturing this data and framing batches for some gropups of data  .....

Thanks & Regards

Sarita

[unclebump]

Do you have the spc toolkit??

http://www.ni.com/pdf/products/us/4msw64-65.pdf

[MindPower]

Hi,

Thanks for your reply.

I do have SPC Toolkit and I have resolved that issue but I am now trying to use Paereto Analysis .Can you please give me some information related to this concept like how do we use it and what are the inputs that we should give to this pallete .

Regards!

Sarita

[unclebump]

Look in this file

C:\Program Files\National Instruments\LabVIEW 7.0\examples\SPC\Spc_exmp.llb

[MindPower]

Hi,

This link is very helpful.

Thanks !

I am exploring it.Hope my problem gets solved there.

Regards!

Sarita