Use the formula or enter measurements into online calculator using the formula l 2c d2 d1 2 d2 d1 2 4c calculate length of the v belt where l denotes the length. The v shape of the belt tracks in a mating groove in the pulley or sheave so that the belt.
Measure the distance between the two pencil marks to determine the circumference of the v belt.
How to measure v belt. For example if the outer measurement is 48 inches and you subtract two inches then hsa46 would be the right belt for your fan. Classical belt measurement tips. Effective length is measured at the effective outside diameter of the sheaves pulleys which is the location on the sheave where the groove s top width is measured.
Roll the v belt along the flat surface until the paint mark rolls back to the flat surface. Multiply that measurement by one sixty fourth of an inch. When measuring be sure to have the belt under slight tension.
Measure the diameters of the small pulley denoted by d1 and the large pulley d2. For instance if the belt has a code like a34 then the outside circumference of the belt is 36 inches 91 cm. Next for a belts 1 2 width subtract two inches from the outside measurement to select the correct v belt.
Place a second pencil mark on the flat surface to designate the contact point of the paint mark with the flat surface. Add 2 inches 5 1 cm to an a prefix 3 inches 7 6 cm to a b prefix 4 inches 10 cm to a c prefix 5 inches 13 cm to a d prefix and 6 inches 15 cm to an e prefix. Set the second o ring on the plunger against the body of the tension gauge at the zero mark.
Roll the v belt along the flat surface until the paint mark rolls back to the flat surface. V belts also known as vee belt or wedge rope are an early solution that solved the slippage and alignment problem. Place a second pencil mark on the flat surface to designate the contact point of the paint mark with the flat surface.
Both effective length and pitch length are measured with the belt tensioned by a specified amount. Alternatively the pitch length is measured at the pitch diameter of the sheaves. Measure the distance between the two pencil marks to determine the circumference of the v belt.
An additional option is to wrap a small diameter string rope around the belt then measure the length of the string. Measuring belt length without an existing v belt wrap 1 4 inch nylon rope around both pulleys. Set the o ring on the handle of your tension gauge to the measurement from your calculation.
If your belt is 16 inches the equation is 1 64 x 16 16 64 or 1 4 of an inch. The most accurate way to measure the circumference of a v belt is with a v belt measuring tool or using a cloth tape measure not a steel tape measure or ruler. V belt is the rubber belt that drives things such as the alternator air conditioning compressor power steering pump and waterpump.
Overlap 4 inches of the nylon rope.