Megapower
46Pages

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 type 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...

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 are indicated in the products pages. 2. Length...

CLASSIFICATIONS CLASSIFICATIONS MEGAPOWER timing belts are manufactured in thermoset polyurethane, with helically wound zinked steel. This type of belts, developed by our Research & Development, offers 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 grey/green thermoset polyurethane 88 ShA, characterized by high levels of wear resistance even in the presence of shock...

CLASSIFICATIONS MECHANICAL AND CHEMICAL CHARACTERISTICS BODY MEGAPOWER belts are manufactured with grey/green thermoset polyurethane 88 ShA as standard. Special compounds (different hardnesses, special properties) are available on request. Here under 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...

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 use in drives with metal detectors, and they also are widely used in 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 diameters than standard cords. They are suitable for multi-shaft drives with severe...

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

TECHNICAL CALCULATION POWER TRANSMISSION CALCULATION PROCEDURE n2 belt width belt length center distance arc of contact safety factors transmittable power each cm of tooth in mesh transmittable force speed ratio speed of driver / driven pulley pitch diameter of driver / driven pulley no. of teeth of driver/ driven pulley drive torque DETERMINATION OF BELT PITCH The belt pitch can be determined with the belt selection chart at 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 of...

TECHNICAL CALCULATION POWER TRANSMISSION CALCULATION PROCEDURE CALCULATION OF REQUIRED BELT LENGTH The belt length can be determined 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 CENTER DISTANCE (see belt page), the closest to the calculated Lw. CALCULATION from those available in the table CALCULATIONThe CENTER DISTANCE distance can be determined replacing your values in 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 PROCEDURE For C the Load Factor depending on the type of driver used by internal transmission of the driven machine. C is values see the table 1 at page 8. 3 For C3 values see the table 1 at page 8. DETERMINATION OF NUMBER OF TEETH IN MESH...

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