What is capability ratio? - Metrology & Quality Control

Q.  What is capability ratio?
- Published on 07 Aug 15

a. The ratio of process capability and number of units inspected
b. The ratio of specification range and process capability
c. The ratio of number of defectives and process capability
d. The ratio of number of defectives and number of units inspected

ANSWER: The ratio of specification range and process capability

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    Discussion

  • Sravanthi   -Posted on 27 Oct 15
    - Capability ratio is defined as the ratio of specification range and process capability.

    - Specification range = ( USL – LSL) and process capability = 6σ

    - Minimum value of Cp required for general purpose is 21.33 and has a rejection number of 64 ppm.

    - If the value of Cp is high, less number of defects are produced and has better accuracy.

    Process capability: In terms of quality control, process capability is equal to 6σ. Because the shafts produced are in the range of x̿ ± 3σ , if the process is under statistical control with respect to control limits.

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