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Analyzing Process Capabilities

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Newbie

Analyzing Process Capabilities

By Piet Watte

processcap.png

About this worksheet:

  • Uses the process potential index to assess the performance of a process and maps, Cp, to the number of defects in a process 
  • Applicable in statistics, specifically for manufacturing and process control 
  • Performs six sigma, cnorm function to integrate, and in-line programming

This worksheet using PTC Mathcad takes a normal distribution to represent the amount of products lying outside the tolerance limits. You can pick a Cp value of the characteristic that is of interest and integrate to estimate the number of non-conforming products associated to the specific sigma level. You can also incorporate safety tolerances to account for process drift from the mean. Specifically this worksheet shows you how to: 

  • Use performance indices to characterize processes 
  • Relate process capabilities to defect levels 
  • Incorporate the process drift from the mean 
  • Design for processability

This worksheet using PTC Mathcad provides you with notation and step by step instruction, along with all formulas, sample data, calculations, solutions, and graphs and charts to aid you.

Download and explore this worksheet yourself! You can download a free lifetime copy of PTC Mathcad Express and get 30 days of full functionality.