How to Calculate V Belt Sizing

Written by cameron easey
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The type of drive belt that is used to transfer power from one shaft to another is called a "V-belt." This belt has a groove on one side that allows it to be seated within a pulley. This prevents the belt from coming off as it moves. The correct size belt should be selected when it comes time to replace a V-belt. To obtain the size, measure the belt to calculate its length.

Skill level:
Moderately Easy

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Things you need

  • Wire cutters
  • Tape measure

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Instructions

    Measure the Belt

  1. 1

    Remove the V-belt from the pulleys on the engine.

  2. 2

    Lay the belt on the ground or on a bench. Cut the belt with a pair of wire cutters and then stretch it out.

  3. 3

    Measure the length of the belt by using the tape measure.

    Calculate the Length

  1. 1

    Measure the distance from the centre or one pulley to the centre of the other pulley. Make a note of the measurement, such as 26 inches.

  2. 2

    Measure the diameter of a pulley and make a note of the measurement, such as 3.5 inches.

  3. 3

    Enter "26" for "l" into the equation L= (2 x l) = (Pi x D). Enter "3" for "D" in the equation.

  4. 4

    Reduce the equation L = (2 x 26) + (Pi x 3.5) into L = 52 + 11 which equals 63 inches.

Tips and warnings

  • You can measure the circumference of a V-belt with a paper tape measure in lieu of cutting the belt.
  • Use a calculator is you do not want to calculate V-belt length by hand.

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