1. The upper and lower specification limits for a component are 0.150 cm. and 0.

Question

1. The upper and lower specification limits for a component are 0.150 cm. and 0.120 cm., respectively. The process standard deviation is 0.003 cm. and the process average is 0.138 cm. Which of the following measure should be computed to determine if the process is capable?

e- Process standard deviation

2. The upper and lower specification limits for a component are 0.150 cm. and 0.120 cm., respectively. The process standard deviation is 0.003 cm. and the process average is 0.138 cm. What conclusion can be drawn?

3. The specification for a component is 16 +/- 0.8 ounces. The process standard deviation is 0.2 ounces and the process average is 16.5 ounces. What conclusion can be drawn?

Explanation / Answer

1 ANS)   A process is centered if its process mean is centered on the specification range

S.L = ( USL+ ISL ) / 2

= ( 0.150+ 0.120 ) /2 = 0.270 / 2 = 0.135 cm

GIVEN the process average is 0.138 cm. . 0.1380.135

so it is not centered on the specific range so you use Cpk

answer is a)

2 ans) if a process is to be capable if a process meets its specification option a- The process is capable

as from above sum we can say it is capable

3 ans) S.L = ( USL+ ISL ) / 2

= 16+.0.8 / 2 = 8.4

process average = 16.05 which is not equal to 8.4

so the process is not centered and not capable

Specification mean is the average of the upper and lower specification limit. A process is centered if the

specification mean is equal to the process mean

so answer is option c

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