In this Question Line Video, Jason responds to a question submitted through our new GD&T Questions submission page: 

I have a question regarding cylindricity. If we’re measuring the ID of a bore (and let’s assume the entire length of the bore is straight) … And I measure .3750 ID at the top of the bore, and .3748 ID at the bottom of the bore… what would the cylindricity value be? Remember, these are being checked as diameters with an air gage.

In the video, Jason reviews cylindricity and how it is measured. He answers the above question based on the assumptions given, and also discusses how cylindricity error is affected when these assumptions are removed. 



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