Question

The head of an automobile engine must be machined so that both the surface that meets the engine block and the surface that meets the valve covers are flat. These surfaces must also be 4.875 ± 0.001 in. a part. Assuming that the valve-cover side of the head is finished correctly, compare the capability of two processes for performing the finishing of the engine-block side of the head. [Two processes, broaching and milling can do the job with the following data:

Process	Broaching	Milling
X	4.877	4.875
R	0.0005	0.001
Sample size	4	4
No. of samples	25	20

1. Calculate the capability of each process?
2. For each process, what proportion of products is nonconforming to specifications?

Answer 1

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