Problem $3$g$)$ What can you conclude about the process capability, i$.$e$.$ capability of this machine $($and the tool used$)$ to cut the keyseat to specifications? Next week you will see that six sigma capable processes have capability indices Cp $>=2$ and Cpk $>=1\mathrm{.}5.$ DeGarmo mentions that a manufacturing process should have at least Cp $>=1\mathrm{.}33($which is four$-$sigma capable process, provided it is reasonably centered$),$ and that is considered as "mediocre," or "industry average." Two$-$sigma $($Cp $=0\mathrm{.}67)$ capability reflects poor quality, or "non$-$competitive" manufacturing.

Question $18$ options:

The Machine B is very capable of machining $2\mathrm{.}625\backslash$pm $0\mathrm{.}010$ inch outside diameter on this part, as no scrap was made $($Table $3)$

The capability of Machine B to machine the outer diameter of this cylinder to $2\mathrm{.}625\backslash$pm $0\mathrm{.}010$ inch is very low

No conclusion can be made about the capability of this process