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[deleted] t1_j2ne4t8 wrote

[deleted]

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chiefd59 OP t1_j2nk4nd wrote

I did the 3 sigma limits a few years ago. They weren’t very compelling.

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RomulusSc2 t1_j2o0b4u wrote

Now you gotta try to sell this data back to them for absolutely no reason. Frame it as "Money saving" or "efficient". Then take that money and give it back to the owner and tell him you just want a burrito every saturday.

There's your end game.

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pipboyover9000 t1_j2nuvru wrote

Control limits are set by the organization running the process and are only used as an indicator to an engineer that a process is out of the desired control. Using control limit methods is irrelevant here as any limit average is assumed to not change over time which is clearly incorrect and the data would need to be normalized first.

The calculations that you speak of are very weak when you only take one sample at a time, which is why you see guys on the floor pull off like 3-5 at a time and average them.

Did you just take a manufacturing class or something?

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