Good morning folks. i have an issue with concentricity, or how pcdmis calculates concentricity.

pcdmis 3.5 mr 1 ph 10t tp20

please see attached amature drawing. i need to verify concentricity of the 2 radius A and B. my alignment is shown on drawing. im creating seperate circles and concentricity reported by pcdmis is .0129". I can live with that but in checking my Y and Z position i am getting .0000 deviation in Z to each other and .0023" deviation in Y to each other. I dont understand how pcdmis gets .0129" concentricity. I have tried making seperate cylinders on each radius from more circles and still get apx the same. please enlighten me as to a better way to do this, or how pcdmis calculates. from documents on pcdmis it says it takes the 2 features and makes 1 a datum and checks perpendicular distance from centroid of one to the other and doubles the variance. if so the variance would only be .0046" right?

thanks in advance for the help.

pcdmis 3.5 mr 1 ph 10t tp20

please see attached amature drawing. i need to verify concentricity of the 2 radius A and B. my alignment is shown on drawing. im creating seperate circles and concentricity reported by pcdmis is .0129". I can live with that but in checking my Y and Z position i am getting .0000 deviation in Z to each other and .0023" deviation in Y to each other. I dont understand how pcdmis gets .0129" concentricity. I have tried making seperate cylinders on each radius from more circles and still get apx the same. please enlighten me as to a better way to do this, or how pcdmis calculates. from documents on pcdmis it says it takes the 2 features and makes 1 a datum and checks perpendicular distance from centroid of one to the other and doubles the variance. if so the variance would only be .0046" right?

thanks in advance for the help.

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