Cylindricity Measurements

In this Question Line video, Jason answers the following question submitted by a user through our new GD&T Question 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.”
Follow along as Jason reviews cylindricity and how cylindricity error is measured.
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#gdandt #gdandtinspection #cylindricity

[@user-nh7gk1bw7d]

Air gage, what is that? Not ever heard about that.

[@AlexLapugean]

Why do people ask these obvious questions? You want to know the cylintricity, you MEASURE CYLINDRICITY. You can't just measure something else and then just assume things. That is the first step to bad engineering, where components end up being functional by chance or overengineering, not by virtue of good design and control.