POWERGRIP GT3DRIVE DESIGN MANUALPOWERGRIP GT3DRIVE DESIGN MANUAL

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Copyright 2014Gates CorporationDenver, Colorado 80217Printed in U.S. of America

* Taper-Lock is a trademark of Reliance Electric* QD is a trademark of Emerson Electric

Introduction to PowerGrip Belt Drives .................................... 2PowerGrip Belt Drive Selection Procedure ............................3-4 High Speed Drive Survey

and Energy Savings Worksheet ...................................... 5 Design IQ Data Worksheet ............................................. 6 PowerGrip GT2 & HTD Belt Pitch Selection Guide ......... 7 PowerGrip Timing Belt Pitch Selection Guide ................... 7 NEMA Minimum Recommended Sprocket Outside Diameters ........................................ 8PowerGrip GT3 & HTD Belt Drives ........................................... 9 Stock Lengths and Widths ............................................. 10 Basic PowerGrip Service Factors ................................... 11PowerGrip GT3 Belts ............................................................. 12 Drive Selection Tables 5mm Pitch Belts ...................................................12-21 8mm Pitch Belts ...................................................22-33 14mm Pitch Belts .................................................34-45 Power Rating Tables 5mm Pitch Belts ...................................................46-47 8mm Pitch Belts ...................................................48-50 14mm Pitch Belts .................................................51-53PowerGrip HTD Belts ............................................................ 54 Drive Selection Tables ..............................................54-57 Power Rating Tables 20mm Pitch Belts .................................................58-60PowerGrip Timing Belt Drives ............................................... 61 Stock Lengths and Widths ............................................. 62 Drive Selection Tables XL, 0.200 Pitch Belts ..........................................64-81 L, 0.375 Pitch Belts ............................................82-91 H, 0.500 Pitch Belts ..........................................92-103 Horsepower Rating Tables XL, 0.200 Pitch Belts ......................................105-106 L, 0.375 Pitch Belts ........................................107-109 H, 0.500 Pitch Belts ........................................110-114PowerGrip Long Length Belting ....................................115-117PowerGrip Twin Power Belts ......................................119-130 Drive Selection Procedure ....................................124-125 Power Rating Tables ............................................125-130PowerGrip GT2 Sprocket Specifications .............................. 131 Sprocket Specifications Tables 5mm Pitch Sprockets .......................................132-135 8mm Pitch Sprockets .......................................137-141 14mm Pitch Sprockets .....................................142-146PowerGrip HTD Sprocket Specifications .............................. 147 20mm Pitch Sprockets .....................................148-151PowerGrip Timing Belt Pulleys ............................................ 152Sprocket Specifications ...................................................... 153Recommended Re-bore Specifications & Instructions .....154-155Taper-Lock* Bushings ....................................................... 156QD* Bushings .................................................................... 157

Bushing and Keyseat Information ................................158-159Taper-Lock Type Sprocket Installation and Removal .................................................................. 160QD Type Sprocket Installation and Removal .................................................................. 161Belt Drive Tensioners ...................................................162-163Sprocket Specification Tables ......................................164-167Engineering Data ................................................................ 168 Section IApplication Design Considerations ............. 168 1. Gear Motors/Speed Reducer Drives ..................... 168 2. Electric Motor Dimensions ................................... 169 3. Minimum Recommended Sprocket

Diameters for Electric Motors .............................. 170 4. High Driven Inertia ............................................... 170 5. Air Moving Drives ................................................ 170 6. Linear Motion Drives ............................................ 171 7. High Performance Vehicle Applications ................ 171 8. Belt Drive Registration ......................................... 171 9. Belt Drive Noise ................................................... 172 10. Use of Flanged Sprockets .................................. 173 11. Fixed (non-adjustable) Center Distance.............. 173 12. Use of Idlers ...................................................... 174 13. Specifying Shaft Locations in Multipoint

Drive Layouts .................................................... 174 14. Minimum Belt Wrap and

Tooth Engagement ............................................ 175 15. Adverse Operating Environments ....................... 175 Section IIEngineering Design Considerations ........... 176 1. Belt Storage and Handling ................................... 176 2. Center Distance and Belt Length ......................... 177 3. Tooth Profiles ...................................................... 177 4. Static Conductivity ............................................... 178 5. Sprocket DiameterSpeed ................................. 178 6. Efficiency ............................................................. 178 7. Belt Tolerances .................................................... 179 8. Belt Installation Tension ....................................... 180 9. Center Distance Allowances

for Installation and Tensioning ............................. 182 10. Drive Alignment ................................................. 182 11. Belt Installation .................................................. 183 12. Belt Pull Calculations ......................................... 183 13. Bearing/Shaft Load Calculations ........................ 183 14. Self-Generated Tension ..................................... 184Technical Data Made-To-Order (MTO) Metals and PowerGrip Belts ..... 185 Troubleshooting ...................................................186-187 Standard Calculations ................................................ 188 Useful Formulas and Calculations.........................189-190Application Examples ...................................................192-195

Table of Contents

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WARNING! Be Safe! Gates belt drive systems are very reliable when used safely and within Gates application recommendations. However, there are specific USES THAT MUST BE AVOIDED due to the risk of serious injury or death. These prohibited misuses include:

Primary In-Flight Aircraft SystemsDo not use Gates belts, pulleys or sprockets on aircraft, propeller or rotor drive systems or in-flight accessory drives. Gates belt drive systems are not intended for aircraft use.

Lift SystemsDo not use Gates belts, pulleys or sprockets in applications that depend solely upon the belt to raise/lower, support or sustain a mass without an independent safety backup system. For applications requiring special Lift or Proof type chains with minimum tensile strength or certified/test tensile strength requirements, be advised that because Gates belts have different drive design procedures from metal chains, the tensile strength of a belt when compared to the tensile strength of a chain should only be a part of the design process. Diligent analysis with the customers participation should be used when considering any such application.

Braking SystemsDo not use Gates belts, pulleys or sprockets in applications that depend solely upon the belt to slow or stop a mass, or to act as a brake without an independent safety backup system. Gates belt drive systems are not intended to function as a braking device in emergency stop systems.

Safety Policy

Drive design software can be found at www.gates.com/drivedesign.This software assists designers in quickly selecting optimum drive solutions

DRIVE DESIGN SOFTWARE

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PowerGrip GT3 Belt Drives

Belt Construction PowerGrip GT3 drives provide positive, trouble-free power transmission and offer many advantages over conventional chain, gear and other belt drives.

Advantages:n Higher capacityn Improved registrationn Reduced noisen No lubrication requiredn No stretching due to wearn Corrosion resistancen Excellent abrasion resistancen Clean operationn Long trouble-free service

Construction Features

The tooth design substantially improves stress distribution and allows extra high loading. The molded teeth enter and leave the sprocket grooves smoothly with negligible frictionfunctioning in much the same way as teeth on a gear.

Construction consists of these components:

1. Fiberglass Tensile Member Provides high strength, excel-lent flex life and high resistance to elongation.

2. Neoprene Backing Strong Neoprene bonded to the tensile member for protection against grime, oil and moisture. It also protects from frictional wear if idlers are used on the back of the belt.

3. Neoprene Teeth Shear-resistant Neoprene compound is molded integrally with the Neoprene backing. They are precisely formed and accurately spaced to assure smooth meshing with the sprocket grooves.

4. Nylon Facing Tough nylo