When measuring V belts, the typical practice is to measure the effective length of the belt, which is the circumference of the belt’s path when installed and tensioned properly. This measurement is typically taken on the inside of the belt.
The inside measurement is commonly referred to as the “pitch length” or “effective length” and is the distance along the inner side of the belt where it contacts the pulleys. This measurement is important for determining the appropriate size and fit of the belt in a given application.
It’s worth noting that V belts are available in standard nominal sizes, and the actual measured length of a belt can vary slightly due to manufacturing tolerances and stretching over time. When selecting a belt, it’s important to choose a size that closely matches the required effective length based on the application’s center-to-center distance and pulley diameters.
If you need to measure the length of an existing V belt, you can use a flexible measuring tape or string to wrap around the inside of the belt’s path, following the contour of the belt within the pulleys. This will give you the effective length of the belt.
Remember to consult the manufacturer’s guidelines or seek advice from professionals in power transmission systems for accurate sizing recommendations for your specific V belt application.