The critical design specification for the
manufacture of a component is the length of the component. The current
specifications are 15 ± 0.05 cm. The organization currently employs a
manufacturing process with the centre at 14.98 and a standard deviation (r) of
(a) What is the process capability of the
(b) Are its potential capability and the actual
capability the same? What is the ratio of the actual capability to potential
capability? What does this ratio indicate?
(c) If the organization is interested in
ensuring a quality level of 64 ppms and is unable to shift the process average,
what should the spread be to achieve this quality level?
(d) If the process is centred to the
nominal value (design specification), what will the actual capability be?