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How to find EXACT number of layers for coil wound on drum. Inner and outer diameter and thickness are known?

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How to find EXACT number of layers for coil wound on drum. Inner and outer diameter and thickness are known?

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  1. It seems to me that if you take the 1/2 of the Outside Diameter and subtract  1/2 the inside diameter, and divide the answer by the thickness of the material wound around it, you will know the number of layers (wraps) in the coil.  

    Example: a coil of aluminum valley flashing is found to be 6" outside diameter.  The inside diameter is 5".  Subtract 1/2 the ID (2-1/2") from 1/2 the OD (3") for a thickness of 1/2".  Divide the thickness (1/2") by the thickness of the material (.019") yields 26 winds (layers).

    The outside circumference (C= pi x D) 6" x 3.1416 =approx 18" x 26 wraps' = 468"/12 = approx. 39' in length.

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