The specifications for a manifold gasket that installs between two engine parts

Question

The specifications for a manifold gasket that installs between two engine parts calls for a thickness of 2.500 mm ± .020 mm. The standard deviation of the process is estimated to be 0.004 mm. The process is currently operating at a mean thickness of 2.50 mm. What is the Cp for this process? Is this process capable?

Not enough information

1.67 - capable

0.835 - capable

1.67 - not capable

which is the correct answer?

Not enough information

1.67 - capable

0.835 - capable

1.67 - not capable

which is the correct answer?

Explanation / Answer

Hi

Here

USL (Upper specification limit )-2.52 mm

LSL(Lower specification limit) -2.48 mm

SD-0.004

Mean-2.50mm

so now CP =(2.52-2.48)/(6x 0.004)

=1.67

Now process CP =(USL-mean/ 3*std.Dev)

=(2.52-2.50)/3 x 0.004)

=1.67

Solution 2:

=(mean-LSL/3*std.Dev)

=(2.5-2.48)/(3*0.004)

=1.67

so answer 1.67 is CP and answer is 1.67 capable.

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