Process capability index - measure of inherent capability, Operation Management

Process Capability Index - Measure of the Inherent Capability

This index provides a measure of the inherent capability of a process by simply relating the 6σ spread of the process to the tolerance band. The assumption is made that the mean m of the process lies at mid- tolerance, as shown in the figure below. If the Cp index is less than 1, then a significant proportion of the process output will be out with specification, even when the process mean is centred within the tolerance band.

74_Process Capability Index - Measure of Inherent Capability.png

If the Cp index value is equal to 1, then, provided the process mean is centred within the tolerance band, only 3 parts per thousand (0.3 per cent) will be outwith the specification. If the Cp index value is greater than 1, and the process mean is centred, then a correspondingly higher proportion of the output will conform to specification. For example, GE/Motorola's six-sigma (ie ±6 sigma) programme equates to a Cp index value of 2, and a non- conformance rate of 3.4 parts per million.

Posted Date: 3/16/2013 1:24:55 AM | Location : United States







Related Discussions:- Process capability index - measure of inherent capability, Assignment Help, Ask Question on Process capability index - measure of inherent capability, Get Answer, Expert's Help, Process capability index - measure of inherent capability Discussions

Write discussion on Process capability index - measure of inherent capability
Your posts are moderated
Related Questions
A location analysis for Temponi Controls, a small manufacturer of parts for high-technology cable systems, has been narrowed down to 4 locations. Temponi will need to train assembl

What is utility of materials requirement planning second to manufacturing operations? It is evolved by MRP-I. A system which incorporates not only material needs, but all manuf

Explain Production in terms of management. Production is any procedure or process developed to transform a set of input elements as men, capital, materials, energy and inform

suggested modification in enhancing logistics system

What are major and minor decisions? Decision with regard to financial outlay can be minor or major. A decision concerned to the purchase of a CNC machine costing several lakhs

1. Based on GM's current condition, do you think it is ethical to reduce the number of employees? Why or why not?

Characterize the bacterial and bacterial-like STIs, focusing on infectious agents and manifestations

Make a list of five ways that Bill could protect the data and systems that he is going to put in place. Consider the type of data and systems that would be relevant to Bill's pizz

You have a lease on an oil and gas property with 87.5% NRI that delivers your firm annual profits of $400,000 for five years, with equal production in each year (you will need to t

Do you think these primary external organizational considerations are the same across all industries, or do different industries (like manufacturing vs. health care) have different