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Gage RR: What does it really tell me?

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    jediblackbelt
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    I understand that the Gage R&R basically tells me that X% of my overall variation is in the R&R, correct?  What I am struggling with is what does that really tell me in regards to my type I&II errors?  If my Gage R&R is >30% it tells me I need major work on the gage and if it’s <10% then the gage is alright.  But how does it equate back to I have a X% chance of either passing bad or rejecting good?
    Struggling with the concept.

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