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Ovality and Taper Guages are used
By definition, a cylinder has two equal circular (or elliptical) faces and a uniform cross section. Therefore, a cylinder cannot be tapered.
The purpose of measuring taper angle is to obtain taper angle
Metric Taper Call Out - Means 1 mm taper every 5 mm of length.
The taper angle is the angle where a thread is tapered as it is created. The formula to find it is to subtract the small diameter from the large diameter and multiply by 28, then divide by the length of the taper.