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Gears

Product catalog summary

Overview: This document serves as a comprehensive guide on various types of gears, including stock and made-to-order options. It covers specifications, numbering systems, gear styles, and horsepower ratings for different gear types.

Stock Gears: Stock gears are categorized into spur, bevel, miter, and worm gears, each available in different pressure angles and diametral pitches (DP), with specific horsepower ratings.

Made-to-Order Gears: Custom gears can be ordered with specific materials and configurations. The numbering system indicates material, type, pitch, number of teeth, and other specifications.

Numbering System: The numbering system uses prefixes and suffixes to denote material, gear type, pressure angle, and other characteristics. For example, 'S620-14½°' indicates a steel spur gear with a 6 pitch and 20 teeth at a 14½° pressure angle.

Gear Styles: Spur gears are available in various styles, including plain, with hubs, and with web or spokes. Cast gears are machined for strength and larger bores.

Spur Gears: Detailed specifications for spur gears with 14½° and 20° pressure angles are provided, including dimensions, bore sizes, and weight. Different styles and materials are available, such as steel and cast iron.

Horsepower Ratings: Horsepower ratings for spur, bevel, miter, and worm gears are included, indicating the power capacity of each gear type.

Engineering Data: The document includes engineering data such as gear drive selection, horsepower formulas, and standard tolerances. Formulas for spur, bevel, miter, and worm gears are provided for precise calculations.

Materials: Information on materials used for spur gears is provided, highlighting the importance of material selection for performance and durability.

Specifications: The document details specifications for various gear types, including pressure angles, pitch diameters, bore sizes, and materials like steel and cast iron.

Procedures and Recommendations: Recommendations include not mixing gears with different pressure angles, adhering to maximum bore sizes, and consulting the factory for non-standard applications.

Limitations: Pitch line velocities exceeding 1000 feet per minute are not recommended. Non-metallic gears are typically used for driving pinions in high-velocity applications.

Data Tables: Tables provide detailed measurements for each gear type, including catalog numbers, teeth count, pressure angles, pitch diameters, bore sizes, hub diameters, and weights. Horsepower ratings tables show performance metrics at various RPMs for both steel and cast iron gears.

Bevel and Miter Gears: Bevel gears are used for right-angle drives with high efficiency, available in ratios from 1:1 to 6:1. Miter gears are used for right-angle drives with a 1:1 ratio, requiring precise mounting.

Worm and Worm Gears: Specifications for worm and worm gears include pitch, face width, pressure angle, and materials. The document emphasizes accurate center distance and bore sizes in gear selection.

Spur Gear Drive Selection Process: The document outlines a step-by-step process for selecting spur gear drives, including data collection, design horsepower calculation, pitch diameter determination, and adjustments for insufficient horsepower capacity.

Technical Specifications and Formulas: The document provides formulas for calculating gear dimensions and conversions between metric and diametral pitch systems. It emphasizes precision in gear manufacturing and the importance of material selection and hardening techniques.

Catalog excerpts

Index Section G GEARS PAGE

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Stock Gears Spur Gears GEARS Miter Gears Bevel Gears Worm and Worm Gears Gear Rack

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“Made-To-Order” Gears

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Stock Gears Numbering System Letters (Prex) Indicate Material and Type Gear. Letters (Sufx) Indicate Hardened, Number of Threads, Direction of Rotation and KW and SS. Numbers Indicate Pitch, Number of Teeth, and Ratio (Sufx). Spur Gears S=Steel TS=Steel 20° C=Cast TC=Cast 20° H=Hardened Teeth NM=Non-Metallic Note: Pressure Angle is Shown as a Sufx to Part Number of All Our Spur Gears. R=Rack — Steel RA=Rack — Steel Heavy Backing TR=Rack — Steel 20° Heavy Backing R20=Rack — Steel 20° Wide Face R-6X2 (141⁄2° STD Backing 6PX2′ Long) RA-6X4 (141⁄2° Heavy Backing 6PX4′ Long) TR-6X6 (20° STD Width...

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Styles of Spur Gears Martin Stock Spur Gears are available in ve different styles. Steel Gears are furnished in plain style and plain style with hub. Cast gears are furnished, plain with hub, web with lightening holes, and spoke. Cast gears are machined on all operating surfaces. Martin cast gears are cast with larger hub to provide extra strength and to allow for larger bores. • Plain Without Hubs • All Steel Type B1 • Web • All Steel • Cast Type B2 • Web With Lighten Holes • All Steel • Cast Type B • Plain With Hubs • All Steel • Cast Type B3 • Web With Spokes • Cast

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Steel Stock Spur Gears Web With Lighten Holes Steel Catalog Number Diameter Pitch * Recommended Maximum Bore With Keyway and Setscew. † Enlarged Pitch Diameter with Special Tooth Form. ¥ 4″ Face. Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2 P.A. Gears Will Not Operate With 20° P.A.

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Cast Iron Stock Spur Gears Web With Lighten Holes Cast — Style “B” Diameter Catalog Number * Recommended Maximum Bore With Keyway and Setscrew. Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2° P.A. Gears Will Not Operate With 20° P.A.

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Steel Stock Spur Gears Web With Lighten Holes Catalog Number Diameter Pitch * Recommended Maximum Bore With Keyway and Set Screw. † Enlarged Pitch Diameter with Special Tooth Form. Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2° P.A. Gears Will Not Operate With 20° P.A.

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Cast Iron Stock Spur Gears Web With Lighten Holes Cast — Style “B” Diameter Catalog Number * Recommended Maximum Bore With Keyway and Set Screw. Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2° P.A. Gears Will Not Operate With 20° P.A.

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Steel Stock Spur Gears Web With Lighten Holes Catalog Number Diameter Pitch * Recommended Maximum Bore With Keyway and Setscrew. † Enlarged Pitch Diameter with Special Tooth Form. Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2° P.A. Gears Will Not Operate With 20° P.A.

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Cast Iron Stock Spur Gears Type B Plain With Hub Web With Lighten Holes Catalog Number * Recommended maximum bore with keyway and set screw. Quotes for large quantity discontinued cast iron sizes, contact your nearest Martin Facility. Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2° P.A. Gears Will Not Operate With 20° P.A.

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Steel Stock Spur Gears Type B2 Type B Plain With Hub Web With Lighten Holes Steel GEARS Catalog Number Diameter Pitch * Recommended maximum bore with keyway and set screw. ** Check application with factory. † Enlarged pitch diameter with special tooth form. Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2° P.A. Gears Will Not Operate With 20° P.A.

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Cast Iron Stock Spur Gears Type B Plain With Hub Web With Lighten Holes Cast — Style “B” Catalog Number Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2° P.A. Gears Will Not Operate With 20° P.A. * Recommended maximum bore with keyway and set screw • Consult Factory. Catalog Number Diameter Pitch Bore (Inches) Stock Keyway Hub (Inches) Diameter Proj.

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Steel Stock Spur Gears Catalog Number Diameter Pitch * Recommended maximum bore with keyway and set screw. ** Check application with factory. † Enlarged pitch diameter with special tooth form. Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2° P.A. Gears Will Not Operate With 20° P.A.

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Cast Iron Stock Spur Gears Type B Plain With Hub Web With Lighten Holes Cast — Style “B” Diameter Catalog Number Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2° P.A. Gears Will Not Operate With 20° P.A. * Recommended maximum bore with keyway and set screw. • Consult Factory. Catalog Number Diameter Pitch Bore (Inches) Stock Keyway Hub (Inches) Diameter Proj.

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Steel Stock Spur Gears Steel GEARS Catalog Number Diameter Pitch * Recommended maximum bore with keyway and set screw. ** Check application with factory. † Enlarged pitch diameter with special tooth form. Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2° P.A. Gears Will Not Operate With 20° P.A.

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Cast Iron Stock Spur Gears Web With Lighten Holes Cast — Style “B” Catalog Number Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2° P.A. Gears Will Not Operate With 20° P.A. * Recommended maximum bore with keyway and set screw. • Consult Factory. Catalog Number Diameter Pitch Bore (Inches) Stock Keyway Hub (Inches) Diameter Proj.

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Steel Stock Spur Gears Type B Plain With Hub Steel GEARS Catalog Number Diameter Pitch * Recommended maximum bore with keyway and set screw. ** Check application with factory. † Enlarged pitch diameter with special tooth form. Bore (Inches) Stock Max.* Hub (Inches) Diameter Proj. 141⁄2° P.A. Gears Will Not Operate With 20° P.A.

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Cast Iron Stock Spur Gears Cast — Style “B” Bore (Inches) Stock Max.* Catalog Number Hub (Inches) Diameter Proj. 14 ⁄2° P.A. Gears Will Not Operate With 20° P.A. * Recommended maximum bore with keyway and set screw. Catalog Number Diameter Pitch Bore (Inches) Stock Keyway Hub (Inches) Diameter Proj.

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