What Is The Formula For CP And CPK?

What does a Cp of 1.33 mean?

Process capability indexProcess capability index (Cpk) is a statistical tool, to measure the ability of a process to produce output within customer’s specification limits.

Cpk = or >1.33 indicates that the process is capable and meets specification limits..

How many ppm is 1.33 Cpk?

In fact, the Cpk is expressed as the ratio of how far the mean of the output data is from the closer spec limit (the centering of the process) to three times their standard deviation (the process variability). Cpk = (USL-Mean) / (3 Stdev)….CpkSigmappm1.30-981.334.00641.37-411.40-2733 more rows

What is PP PPK CP CPK?

Pp, Ppk vs Cp, CPK Cp & Cpk use an estimate for the standard deviation using the R Bar / d2 method. Pp, Ppk are more liberal where Cp, CPK are more conservative. Use Pp & Ppk when you are initially setting up your process. Use Cp & Cpk once the process is in a state of statistical control.

What is a good CP value?

By convention, when a process has a Cp value less than 1.0, it is considered potentially incapable of meeting specification requirements. Conversely, when a process Cp is greater than or equal to 1.0, the process has the potential of being capable. Ideally, the Cp should be as high as possible.

What does a CP of 1 mean?

A Cp of one indicates that the width of the process and the width of the specification are the same. A Cp of less than one indicates that the process spread is greater than the specification. This means that some of the data lies outside the specification.

What is CP and CPK?

Cp and Cpk, commonly referred to as process capability indices, are used to define the ability of a process to produce a product that meets requirements. … Specifications are normally defined in terms of nominal (+/-) tolerances or ranges (low to high.

What is the CP formula?

Formula to calculate cost price if selling price and profit percentage are given: CP = ( SP * 100 ) / ( 100 + percentage profit). Formula to calculate cost price if selling price and loss percentage are given: CP = ( SP * 100 ) / ( 100 – percentage loss ).

How many Sigma is 1.67 Cpk?

6 sigmaCp = Cpk = 1.67. The sigma level is now 5 – the specifications are five standard deviations away from the average. The out of specification has decreased to 0.57 ppm. The fourth curve represents that magical 6 sigma level.

What is CPK in food?

California Pizza KitchenCalifornia Pizza Kitchen (CPK) is a casual dining restaurant chain that specializes in California-style pizza. The restaurant was started in 1985 by attorneys Rick Rosenfield and Larry Flax in Beverly Hills, California, United States.

What does a CP of 2 mean?

Cp: A Tale of Two Tails Higher Cp values indicate a more capable process. When the specification spread is considerably greater than the process spread, Cp is high. When the specification spread is less than the process spread, Cp is low.