Timing belts come in many different types with each type suitable for a certain application. Each timing belt is made out of a specific type of material that makes it perform best in a certain or particular environment. If you are to choose a timing belt for a particular application, always consider the type of material it is made from. This eliminates the need for high tension, lowering shaft and bearing loads. Flat belts can transmit up to 150 hp/in. at speeds exceeding 20,000 fpm. Fig. 1. Flat belts have thin cross-sections and wrap around pulleys easily. A significant advantage of flat belts is efficiency of nearly 99%, about 2.5-3% better than V-belts. The formula for calculating the effective length is: Effective Length = 2C + [ (π (D1 + D2))/2] + [ (D2 – D1)² / (4C)] where C is the center distance, D1 is the diameter of the smaller pulley, and D2 is the diameter of the larger pulley. Identify Belt Tension Factors: Several factors influence the tension required for proper V-belt operation. Belt pitch is the distance between teeth. More precisely, it’s the distance between the same feature on adjacent teeth, not the size of the gap between them: GT2 belts. GT2 belts typically have a tooth pitch of 2 mm (but not always: the “2” in GT2 does not indicate the pitch). The other parameter we need is the number of tooth in the pulley. These calculations are mainly for existing installations but you could also put it towards your design if you want to calculate what the length needs to be of the belt, as long as you already know the distance between the two pulleys and the size of the pulleys. The second part, the distance between the pulleys, is if you already know what Calculate D and d from the data available. Select proper std. pulled diameters based on calculated values from Manufactures Database. Select the nearest available pulley diameter or next available diameter from table. 3. v belt and sample problem - Download as a PDF or view online for free. The length L of a belt traversing three pulleys, as shown in the diagram below, and touching them on one side only, can be found by the following equation. Referring to the diagram, R 1, R 2, and R 3 are the radii of the three pulleys; C 12, C 13, and C 23 are the center distances; and α1, α2, and α3 are the angles, in radians, of the Belt. Number of Grooves (Z b): Show Parts * Custom Belts normally require a New Tooling Charge. ** Custom Pulleys can be manufactured to your specifications. Timing Pulley Calculation Software. selected result (After Part Number selection, it can change conditions of such materials and surface treatment.) Your comments help us improve our website. Give feedback. Use our Timing Pulley Calculation Software to Spec Timing Pulley part numbers. Belt Load. At one time when the load is known per square foot: P= G 1 x C (in feet)x W (in feet) At one time when load is known by pounds per hour: P=G 2 / (S x 60) x C (in feet) g3F0.