General gear terms and definitions. Trantorque 48 DP. Steel and Brass

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1 General gear terms and definitions 317

2 Spur and Helical Gears: Formulae and definitions Helical Gear Spur Gear Term Definition formulae formulae 318

3 Spur and Helical Gears: Formulae and definitions Helical Gear Spur Gear Term Definition formulae formulae 319

4 Tolerances - spur gears 24 DP and finer 320

5 Tolerances - spur gears, metric pitch Total Tooth comp to Quality gs Quality fs error tooth Max Min Max Min comp ind ind ind ind error reading reading reading reading 321

6 Tolerances - Spur Gears 4 DP to 20 DP Max Min Pitch indicator indicator DP reading reading Tolerance 322

7 Spur gear durability and efficiency Abbreviation Terms Unit To be found in 323

8 Spur gear durability and efficiency Ruling Surface Core Thru Material BS No. Condition Section VPN BHN st BHN Sc Sb 324

9 Helical gear durability No. IN MATING GEAR teeth Rack

10 Spur and helical gear durability Hours rpm No. No. teeth in gear being designed teeth

11 Spur and helical gear durability Hours rpm No. IN MATING GEAR teeth Rack

12 Spur and helical gears: assembly data, backlash calculations Indicator Centre Total No. PCD Reading Dist Centre Comp. Gear fp* Teeth DP Inches Max. Min. Tolerance Dist. Error Maximum Equivalent Centre Distance c Probable Max. Probable Max. Angular increase over norm. B/Lash - fp* c x 2tan PA) B/Lash. in Mins. 328

13 Simple calculation for strength Material Value of M plastic 5,000 bonze 10,000 cast iron 12, % carbon steel natural 20, % carbon steel case hardened 25, % carbon steel natural 25, % carbon steel case hardened 30,

14 Rack tooth strength 330

15 Straight bevel gear: Formulae and definitions (Gleason System) Term Definition Pinion Gear 331

16 Straight bevel gear: Formulae and definitions (Gleason System) Term Definition Pinion Gear 332

17 Material Factors Character of load on driven machine Prime Mover Uniform Medium Heavy Shock Shock Gear Pinion Material Minimum Minimum Factor Material Hardness Material Hardness Cm

18 Straight bevel gear: Torque, efficiency, assembly data 334

19 Right-angled gear systems -characteristics maximum pitch line velocity Class Type Power-to- efficiency Ratio max. Com- Aero- type of mounting weight ratio range % range HP (per -mercial space contact sensitivity mesh) ft/min ft/min OFFSET COPLANAR 1 straight bevel medium high :1 to 8: line critical 3 directions 2 Coniflex bevel ¹ medium high :1 to 8: line critical 3 directions 3 spiral bevel very high :1 to 8: line critical 3 directions 4 Zerol bevel ¹ high :1 to 8: line critical 3 directions 5 Revacycle bevel ¹ high :1 to 8: line critical 3 directions 6 Face gear medium high :1 to 8: line critical 1 direction 7 Beveloid ² low :1 to 8: point not critical 8 crossed helical low :1 to 100: point not critical 9 cylindrical worm medium high :1 to 400: line sensitive 2 directions 10 double enveloping worm medium high :1 to 100: line or area critical 3 directions 11a hypoid low ratio high :1 to 10: line critical 3 directions 11b hypoid high ratio medium high :1 to 50: line critical 3 directions 12 Face gear medium high :1 to 8: line critical 2 directions 13 Spiradrive 3 (spiroid) medium high :1 to 400: line sensitive 2 directions 14 planoid high :1 to 8: line critical 3 directions 15 ZTA Spiradrive 3 medium high :1 to 400: line sensitive 2 directions 16 Beveloid ² low :1 to 8: point not critical 1 Zerol, Coniflex & Revacycle Gleason Works 2 Bevaloid Vinco Corp 3 Spiradrive, ZTA Spiradrive Davall Gears Ltd registered trade names 335

20 Worm gear: Formulae and definitions (BS. 721) Term Definition Worm Wheel 336

21 Worm gear: Torque capacity and effciency 337

22 Bearings choice - spur and helical gears Tf tanpa Tf Tf tan 338

23 Bearing choice - straight and spiral bevel gears 339

24 Bearing choice - straight and spiral bevel gears Driving Member Value of seperating component Spiral hand Rotation* of radial load Driving Member Spiral hand Rotation* Value of axial thrust 340

25 Bearing choice - worm gearing 341

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