Spur Gears - Norfolk Bearings and Supply Company, Inc.

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SPUR GEARS Engineering Information Nomenclature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298-299 Involute Form. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 Diametral Pitch / Pressure Angle / Tooth Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301 Backlash / Undercut / Formulas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302 Lewis Formula . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303 HELICAL GEARS Nomenclature / Helix Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304 Formulas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305 Thrust Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306 MITER & BEVEL GEARS Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307 Mounting Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308 Tooth Strength / Thrust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309 WORMS & WORM GEARS Hand / Efficiency / Thrust Loads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310 Formulas / Self-Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311 COUPLING / UNIVERSAL JOINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312 GENERAL INFORMATION Section Contents How To Figure Horsepower & Torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313 Mountings / Alterations / Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314 Materials / Styles / Keyways & Setscrews . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315 Sprockets, Sprocket Diameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316-318 Horsepower & Torque Capacity oOf Shafting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319 Temperature Conversion Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 320 Equivalent Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321 Metric Conversion Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322 Application Classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323-324 INDEX TO CATALOG NUMBERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325-328 P-1930-BG 04/10 Boston Gear 800-825-6544 297 I
I Engineering Information Spur Gears Gear Nomenclature ADDENDUM (a) is the height by which a tooth projects beyond the pitch circle or pitch line. BASE DIAMETER (D b) is the diameter of the base cylinder from which the involute portion of a tooth profile is generated. BACKLASH (B) is the amount by which the width of a tooth space exceeds the thickness of the engaging tooth on the pitch circles. As actually indicated by measuring devices, backlash may be determined variously in the transverse, normal, or axial-planes, and either in the direction of the pitch circles or on the line of action. Such measurements should be corrected to corresponding values on transverse pitch circles for general comparisons. BORE LENGTH is the total length through a gear, sprocket, or coupling bore. CIRCULAR PITCH (p) is the distance along the pitch circle or pitch line between corresponding profiles of adjacent teeth. CIRCULAR THICKNESS (t) is the length of arc between the two sides of a gear tooth on the pitch circle, unless otherwise specified. CLEARANCE-OPERATING (c) is the amount by which the dedendum in a given gear exceeds the addendum of its mating gear. CONTACT RATIO (m c) in general, the number of angular pitches through which a tooth surface rotates from the beginning to the end of contact. DEDENDUM (b) is the depth of a tooth space below the pitch line. It is normally greater than the addendum of the mating gear to provide clearance. DIAMETRAL PITCH (P) is the ratio of the number of teeth to the pitch diameter. FACE WIDTH (F) is the length of the teeth in an axial plane. FILLET RADIUS (r f) is the radius of the fillet curve at the base of the gear tooth. FULL DEPTH TEETH are those in which the working depth equals 2.000 divided by the normal diametral pitch. GEAR is a machine part with gear teeth. When two gears run together, the one with the larger number of teeth is called the gear. HUB DIAMETER is outside diameter of a gear, sprocket or coupling hub. HUB PROJECTION is the distance the hub extends beyond the gear face. INVOLUTE TEETH of spur gears, helical gears and worms are those in which the active portion of the profile in the transverse plane is the involute of a circle. LONG- AND SHORT-ADDENDUM TEETH are those of engaging gears (on a standard designed center distance) one of which has a long addendum and the other has a short addendum. KEYWAY is the machined groove running the length of the bore. A similar groove is machined in the shaft and a key fits into this opening. NORMAL DIAMETRAL PITCH (P n) is the value of the diametral pitch as calculated in the normal plane of a helical gear or worm. NORMAL PLANE is the plane normal to the tooth surface at a pitch point and perpendicular to the pitch plane. For a helical gear this plane can be normal to one tooth at a point laying in the plane surface. At such point, the normal plane contains the line normal to the tooth surface and this is normal to the pitch circle. NORMAL PRESSURE ANGLE (ø n) in a normal plane of helical tooth. OUTSIDE DIAMETER (D o) is the diameter of the addendum (outside) circle. 298 Boston Gear 800-825-6544 P-1930-BG 04/10
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A L T R A I N D U S T R I A L M O T
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Table Of Contents Stock Altered and
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With thousands of stock gears avail
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Custom Gearing “Request For Quota
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Custom Gearing Capabilities Gear Ty
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Gear Selection Stock Gears Spur Gea
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Product Selection / Reference Guide
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Boston Gear Helical Gears ■ Paral
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Boston Gear Worms and Worm Gears
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A Spur Gears 48 and 32 Diametral Pi
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A Spur Gears 10 and 8 Diametral Pit
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A Spur Gears 6 and 5 Diametral Pitc
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A Change Gears 20 Diametral Pitch (
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A Change Gears 12 Diametral Pitch (
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A Change Gears 8 Diametral Pitch (S
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A Drawn Pinion Wire 48, 32 and 24 D
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A Internal Gears 48 through 16 Diam
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A Spur Gears 48 Diametral Pitch (De
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A Spur Gears 32 Diametral Pitch (De
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A Spur Gears 6 and 5 Diametral Pitc
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A Internal Gears 64 through 24 Diam
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A Spur Gears Approximate Horsepower
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B Helical Gears 24 through 10 Trans
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B Helical Gears Selection Procedure
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B Helical Gears Approximate Horsepo
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C Miter Gears 48 through 20 Diametr
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C Miter Gears 8 through 4 Diametral
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C Bevel Gears 48 through 20 Diametr
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C Bevel Gears 12 and 10 Diametral P
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C Spiral Bevel Gears 30 through 8 D
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C Miter Gears Steel & Iron - Straig
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C Bevel Gears Steel & Iron - Straig
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C Notes 84 Boston Gear 800-825-6544
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D Worms & Worm Gears 48 Diametral P
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D Worms & Worm Gears 8 Diametral Pi
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D Worms & Worm Gears 4 Diametral Pi
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D Worms & Worm Gears Selection Proc
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D Worms & Worm Gears Steel-Hardened
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E Shaft Couplings FC Series Insert
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E Shaft Couplings BF Series Bost-Fl
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E Shaft Couplings SCC Series Clampi
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E Shaft Couplings FCP Series Sleeve
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E Universal Joints J/JS Series Bore
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E Universal Joints UJNS/UJNL Series
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E Universal Joints JP Series Single
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E Setscrew Collars SC/SSC Series St
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E Clamping Collars CSC/CSSC/CASC Se
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E Thrust Washers Steel and Stainles
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E Grooved Pulleys G1200 Round Belt
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E Miniature Timing Belts and Pulley
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E Miniature HTD ® Timing Belts 3M
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E Timing Belt Pulleys PA Series For
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E Timing Belt Pulleys PLB Series Fo
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E Miniature HTD ® Timing Belts 5M
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E Timing Belt Pulleys PA Series For
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E Timing Belt Pulleys PLB Series Fo
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F BOST-BRONZ Oil-Impregnated Sinter
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F BEAR-N-BRONZE 660 Cast Bronze Bea
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F Bronze Bearing Emergency Banks Ac
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F BOStonE F-1 Glass Filled Teflon B
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F RULON ® 641 Bearings Boston Gear
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F BOStonE Molded Plastic Bearings B
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F BOStonE Molded Plastic Bearings R
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F BOStonE Molded Plastic Bearings G
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F BOStonE Molded Nylon Bearings Pla
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F Engineering Information Sleeve Be
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F Engineering Information Sleeve Be
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F Engineering Information Lubricati
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F Engineering Information Shaft Cle
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F Engineering Information Machining
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F Anti-Friction Bearings Ball Beari
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F Anti-Friction Bearings 1600 Serie
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F Anti-Friction Bearings Flanged 40
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F Anti-Friction Bearings 600 Series
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F Self-Aligning Bearings KF Female
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F Self-Aligning Bearings CMHD Male/
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F Self-Aligning Bearings HME Male/H
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F Self-Aligning Bearings LHA-LHB-LH
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F Self-Aligning Bearings LS/LSS Ser
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F Engineering Information Engineeri
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F Engineering Information Engineeri
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F Mounted Bearings Replacement Bear
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F Mounted Bearings Replacement Bear
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F Mounted Ball Bearings PS Series P
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F Mounted Ball Bearings L/H Series
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F Mounted Ball Bearings SL/SH Serie
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F Mounted Ball Bearings MB Series P
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F Mounted Ball Bearings XL2/XL3 Ser
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F Mounted Ball Bearings F/T Series
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F Mounted Ball Bearings SF/ST Serie
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F Mounted Ball Bearings MBP Series
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F Mounted Bearings TU Series Take-U
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F Engineering Information Analysis
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F Engineering Information Mounted B
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F Engineering Information Applicati
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F Notes 240 Boston Gear 800-825-654
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G Roller Chains Description of Roll
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G Roller Chains ANSI Standard Doubl
Page 251 and 252: G Engineering Information Conveyor
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Page 255 and 256: G Notes 250 Boston Gear 800-825-654
Page 257 and 258: G Roller Chains Hollow Pin Single a
Page 259 and 260: G Ladder Chain Steel-Stainless Stee
Page 261 and 262: G Chain Pullers Chain Breaking Tool
Page 263 and 264: H Chain Drives Roller Chain Sprocke
Page 265 and 266: H Roller Chain Drives Horsepower Ra
Page 267 and 268: H Roller Chain Drives Horsepower Ra
Page 269 and 270: H Roller Chain Drives Selection SPE
Page 271 and 272: H Miniature Chain Sprockets Single
Page 273 and 274: H Roller Chain Sprockets Single Str
Page 295 and 296: H Block Chain Sprockets Type B Sing
Page 297 and 298: H Ladder Chain Sprockets Type B Sin
Page 299 and 300: H Roller Chain Drive Tensioners Typ
Page 301: H Roller Chain Drive Tensioners Typ
Page 305 and 306: I Engineering Information Spur Gear
Page 307 and 308: I Engineering Information Spur Gear
Page 309 and 310: I Engineering Information Helical G
Page 311 and 312: I Engineering Information Helical G
Page 313 and 314: I Engineering Information Miter and
Page 315 and 316: I Engineering Information Worms and
Page 317 and 318: I Engineering Information Couplings
Page 319 and 320: I Engineering Information General M
Page 321 and 322: I Engineering Information Sprockets
Page 323 and 324: I Engineering Information Sprocket
Page 325 and 326: I Engineering Information Temperatu
Page 327 and 328: I Engineering Information Metric Co
Page 329 and 330: I Engineering Information Applicati
Page 331 and 332: I Index to Catalog Numbers Catalog
Page 333 and 334: I Index to Catalog Numbers Catalog
Page 335: Altra Industrial Motion All Custome
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Spur Gears - Norfolk Bearings and Supply Company, Inc.

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