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RollLength ( CoreExternalDiameter ; RollDiameterWhenNew ; RollLengthWhenNew ; CurrentDiameter )

Allows you to know the length of the film/paper remaining on a roll

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Enzo Borri - Show more from this author http://borri.org

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

// Note: diameters are in millimeters // Length is in meters (Pi * (((CurrentDiameter * CurrentDiameter) / 4) - ((CoreExternalDiameter * CoreExternalDiameter) / 4)) / (((((RollDiameterWhenNew * RollDiameterWhenNew) / 4) - ((CoreExternalDiameter * CoreExternalDiameter) / 4)) * Pi) / (RollLengthWhenNew * 1000))) / 1000 Click to copy

Knowing the dimensions of a roll when new, (the length, its external diameter and the core external diameter) allows you to know the length of the remaining material.

 

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