Question

QC.82 The difference between the upper specification and lower specification for a sheet metal stamping process process is 0.65 cm. The standard deviation of the process is 0.13 cm. What is the process capability ratio (Cp) for this process? True/False: This process is adequately stable to meet the design specifications.

Answer 1

What is the process capability ratio = Cp= 0.833

Step-by-step explanation:

From process capability (Cp) = USL - LSL /6SD

where SD = standard deviation, USL = Upper specification, LSL = Lower specification

SD = 0.13, USL - LSL = 0.65

Cp = 0.65/6x0.13

Cp= 0.833

Since Cp < 1, hence the process is not adequately stable , and as such, it does not meet the design specification.