TECHNICAL HANDBOOK

INDEX Introduction to MEGAPOWER belts MEGAPOWER belts system specifications Power transmission calculation procedure Calculation parameters Belt calculation example Belt installation Causes of belt failure MEGAPOWER feasibility table Cover properties Special execution Special execution photos Pulleys and timing bars Useful formulas and conversion table Data sheet MEGAPOWER megadynegroup.com

INTRODUCTION MEGAPOWER BELTS Megadyne began manufacturing transmission belts in 1957 and moulding MEGAPOWER belts in 1975. MEGAPOWER timing belts are manufactured in thermoset polyurethane by a unique moulding process. The thermoset polyurethane gives superior wear and abrasion resistance. Several types of cords, helically wound rolled up inside the belts, assure excellent dimensional stability, and offer high performances in terms of flexibility and traction resistance. MEGAPOWER belts are particularly suitable for power transmission applications. MEGAPOWER USE ADVANTAGES MEGAPOWER timing belt...

MEGAPOWER BELT SYSTEM SPECIFICATIONS To satisfy a wide range of loads, speeds, and applications, MEGAPOWER belts and pulleys are made in a selection of sizes, capacities, and dimensions. The three most significant dimensions of a belt are: 1. Pitch is the distance in millimetres between two adjacent teeth centers, as measured on the pitch line of the belt. The theoretical pitch line of a MEGAPOWER belt lies within the tensile member. It is indicated with abbreviations like T5, AT5, T10, AT10, H. The correspondence between abbreviations and pitches is indicated in the product’s pages. 2. Length...

CLASSIFICATIONS CLASSIFICATIONS MEGAPOWER timing belts are manufactured in thermoset polyurethane, with helically wound zinked steel. These types of belts, developed by our Research & Development, offer good running characteristics and high traction loads. They are especially suited for power transmission. An extra thickness of special coating is also possible on the back of the belt, offering extra protection against aggressive or heavy products. 1. The body of the belts is in a grey/green thermoset polyurethane 88 ShA, characterized by high levels of wear-resistance, even in the presence of...

CLASSIFICATIONS MECHANICAL AND CHEMICAL CHARACTERISTICS BODY MEGAPOWER belts are manufactured with grey/green thermoset polyurethane 88 ShA, as standard. Special compounds (different hardness, special properties) are available on request. Here below are some PU characteristics: WATER No problem in normal or sea clean water at room temperature. Over 60 ºC, there is a fast decrease of breaking strength. ACIDS In acids-diluted proportions at room temperature, this PU is moderately attached. In high-concentration acid solutions, this PU has a very short lifespan. Over 50 ºC, acids are always dangerous...

CLASSIFICATIONS MECHANICAL AND CHEMICAL CHARACTERISTICS CORDS STANDARD CORD MEGAPOWER is manufactured with helicoidal zinked-steel cords, as standard. KEVLAR ® Kevlar ® tension cords are suggested for non-magnetic, precisely for the use in drives with metal-detectors. They also are widely used in the food industry. HP High-performance cords have 25% more strength capacity than standard cords. They are recommended for high repeatability applications. HF High-flexibility cords can accept smaller pulley’ and idler’s diameters than standard cords. They are suitable for multi-shaft drives with severe...

CLASSIFICATIONS COATING MEGAPOWER belts can be manufactured with special coatings to fit many applications with different requirements. For feasibility, see Table on page 35 and for properties, see on page 36. IDENTIFICATION CODE Using the information in the Table below, it is possible to identify the right belt for every application. The code is composed of letters and numbers as in the following example: 1 MPW SPECIAL MANUFACTURES MEGAPOWER timing belt. This number indicates the width of the requested belt. The value is in mm for a belt with pitch in mm, and inches for a belt with pitch in...

TECHNICAL CALCULATION POWER TRANSMISSION CALCULATION PROCEDURE n2 belt width belt length center distance safety factors transmittable power for each cm of the tooth in mesh transmittable force speed ratio speed of the driver / driven pulley pitch diameter of the driver / driven pulley no. of teeth of the driver/ driven pulley drive torque DETERMINATION OF BELT PITCH The belt pitch can be determined with the belt selection chart on page 11 (for new applications, we suggest AT profiles), referring to the speed of the small pulley. DETERMINATION OF SPEED RATIO The speed ratio represents the ratio...

TECHNICAL CALCULATION POWER TRANSMISSION CALCULATION PROCEDURE CALCULATION OF REQUIRED BELT LENGTH The belt length can be determined by replacing your values in the following formula: POWER TRANSMISSION CALCULATION PROCEDUR ß = arccos The actual belt length is to be taken from those available in the Table (see belt page), the closest to the calculated L w. The actual belt length is to be taken OF fromCENTER those available in the table (see belt page), the closest to the calculated Lw. CALCULATION DISTANCE approximate center distance can be determined by replacing your values CALCULATIONThe OF...

C2 is the Service Factor depending on the number of the operational hours per day (operation time) C2 is the Service Factor depending on the number of the operational hours per day (operation time) h/day h/day C2 POWER TRANSMISSION C is the Load Factor depending on the type of driver used by internal transmission of the driven machine. CALCULATION values see the table 1 at page 8. type of driverPROCEDURE For C C is the Load Factor depending on the used by internal transmission of the driven machine. 3 For C3 values see the table 1 at page 8. DETERMINATION OF NUMBER OF TEETH IN MESH DETERMINATION...

CALCULATION PARAMETERS BELT SELECTION CHART TABLE 1 - LOAD FACTOR C3 Driven Machine Computers, printers Teleprinters, photocopiers Motion-picture projectors and cameras Kitchen appliances, universal slicers Domestic sewing machines Industrial sewing machines Washing machines Bakery machinery and dough mixers Light-duty belt conveyors Belt conveyor for ore, coal, sand Heavy duty conveyors Elevators, screw conveyors Bucket elevators Office machinery Domestic machinery Sewing machines Laundry machinery MEGAPOWER megadynegroup.com