Process capability Premiered by EDOUARD GATETE of  The Pennsylvania State University.
Overview  <ul><li>Definition </li></ul><ul><li>Measurements of process capability control </li></ul><ul><li>How can Proces...
Overview <ul><li>A real world example </li></ul><ul><li>Exercise </li></ul><ul><li>Summary </li></ul>
Definition <ul><li>Process capability is defined as a how likely a product is going to meet the design specification. </li...
Measurements of process capability <ul><li>Most of the times,  conventional process capability work quite well, but we hav...
Measurements of Process Capability <ul><li>The formula C sub P is the tolerance divided by six standard deviations (also k...
How Can Process Capability Be Used in an Organization <ul><li>Basic tools </li></ul><ul><ul><li>measurements data </li></u...
Measurement of process capability <ul><li>Population : a collection of all observation of interest to a decision maker. </...
How to use process capability in an organization <ul><li>The control chart </li></ul><ul><ul><li>bell-shaped curve: as lon...
The difference between  Stable and capability <ul><li>A process is capable if a given product meets specifications. </li><...
The disadvantage of using process capability <ul><li>Over-correcting:  the most common </li></ul><ul><li>reducing variatio...
Factors influencing the tolerance allocation <ul><li>Statistical aspects of the dimensions and manufacturing processes inv...
A real world example <ul><li>Taking an example of a car manufacture company.  The process capability will be used if out o...
Exercise <ul><li>A certain manufacturing process is producing metal washers that have diameters that are known to be norma...
Summary <ul><li>We have just reviewed process capability.  This process is used in production to determine whether a produ...
summary <ul><li>This presentation has definitely focused on the basics of process capability.  It is very important to min...
summary <ul><li>A bibliography used to come up with these slides is as follow; </li></ul><ul><li>Hart, M.  Quality Tools f...
summary <ul><li>Raouf, A. On developing optimal process capability index.  International Journal of Quality & Reliability ...
Summary <ul><li>Foster, T. S. An integrative approach.  Managing Quality 2001. P. 374-376. </li></ul>
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Process Capability[1]

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Process Capability[1]

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Process Capability[1]

  1. 1. Process capability Premiered by EDOUARD GATETE of The Pennsylvania State University.
  2. 2. Overview <ul><li>Definition </li></ul><ul><li>Measurements of process capability control </li></ul><ul><li>How can Process Capability be used in an organization </li></ul>
  3. 3. Overview <ul><li>A real world example </li></ul><ul><li>Exercise </li></ul><ul><li>Summary </li></ul>
  4. 4. Definition <ul><li>Process capability is defined as a how likely a product is going to meet the design specification. </li></ul><ul><ul><ul><ul><li>It has been argued whether the specifications are actually set by customers or design engineers. </li></ul></ul></ul></ul>
  5. 5. Measurements of process capability <ul><li>Most of the times, conventional process capability work quite well, but we have to keep in minds that they will be times when the usual formulas don’t work. </li></ul><ul><ul><ul><li>An index that measure potential process capability is used in unusual situation. </li></ul></ul></ul>
  6. 6. Measurements of Process Capability <ul><li>The formula C sub P is the tolerance divided by six standard deviations (also known as sigma) </li></ul><ul><ul><ul><ul><ul><li>C sub P = tolerance/6-sigma </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Reveals how many six-sigma fits within a specified tolerance </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>In order for a product to meet specifications, at least 99.773% of productions should confirm anticipated operation condition. </li></ul></ul></ul></ul></ul>
  7. 7. How Can Process Capability Be Used in an Organization <ul><li>Basic tools </li></ul><ul><ul><li>measurements data </li></ul></ul><ul><ul><li>a run chart : a plot of data in order of time </li></ul></ul><ul><ul><li>histogram </li></ul></ul>
  8. 8. Measurement of process capability <ul><li>Population : a collection of all observation of interest to a decision maker. </li></ul><ul><li>Sample: a portion of population </li></ul><ul><li>population distribution: a distributions of the entire population </li></ul><ul><li>sampling distribution: distributions of sample means. </li></ul>
  9. 9. How to use process capability in an organization <ul><li>The control chart </li></ul><ul><ul><li>bell-shaped curve: as long as all inputs to a process remain constant, the output will always vary </li></ul></ul>
  10. 10. The difference between Stable and capability <ul><li>A process is capable if a given product meets specifications. </li></ul><ul><li>A process is stable if there is a common variation present in the process </li></ul>
  11. 11. The disadvantage of using process capability <ul><li>Over-correcting: the most common </li></ul><ul><li>reducing variation </li></ul>
  12. 12. Factors influencing the tolerance allocation <ul><li>Statistical aspects of the dimensions and manufacturing processes involved </li></ul><ul><li>Assembly requirements and conditions </li></ul><ul><li>the cost-tolerance relationship </li></ul><ul><li>International Standards Organization's practices for fits. </li></ul>
  13. 13. A real world example <ul><li>Taking an example of a car manufacture company. The process capability will be used if out of 1000000 cars produced, only 3.4 cars come out defective </li></ul>
  14. 14. Exercise <ul><li>A certain manufacturing process is producing metal washers that have diameters that are known to be normally distributed with mean 1 inch and standard deviation .006 inch. The process is known to be stable and in control. The specifications for these washers are 1 inch +/- .01. What percentage are within specification limits? </li></ul>
  15. 15. Summary <ul><li>We have just reviewed process capability. This process is used in production to determine whether a product meets specification on a consistent basis. Even though they are a lot of complex ways to to figured out process capability, it’s more important to understand the basics before we can get in more details. </li></ul>
  16. 16. summary <ul><li>This presentation has definitely focused on the basics of process capability. It is very important to minimize defects in production if you want to optimize the profit. </li></ul>
  17. 17. summary <ul><li>A bibliography used to come up with these slides is as follow; </li></ul><ul><li>Hart, M. Quality Tools for Decreasing Variation and Defining Process Capability. V33 n2. Second Quarter 1992, p.6-11. </li></ul>
  18. 18. summary <ul><li>Raouf, A. On developing optimal process capability index. International Journal of Quality & Reliability Management. V9 n7. 1992. P. 17-22 </li></ul><ul><li>Bothe, D. R. Measure process capability when Cp won’t work. Quality. V34 n8. Aug 1995. P. 20-22 </li></ul>
  19. 19. Summary <ul><li>Foster, T. S. An integrative approach. Managing Quality 2001. P. 374-376. </li></ul>

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