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317
Trantorque
48 DP
Steel and Brass
Conversion imperial to metric
283
General gear terms and definitions
284
Trantorque
48 DP
Steel and Brass
318
Spur and Helical Gears: Formulae and definitions
285
Helical Gear Spur GearTerm Definition formulae formulae
Spur and Helical Gears: Formulae and definitions
286
Helical Gear Spur GearTerm Definition formulae formulae
Trantorque
48 DP
Steel and Brass
319
Spur and Helical Gears: Formulae and definitions
285
Helical Gear Spur GearTerm Definition formulae formulae
Spur and Helical Gears: Formulae and definitions
286
Helical Gear Spur GearTerm Definition formulae formulae
320
Trantorque
48 DP
Steel and Brass
Tolerances - spur gears 24 DP and finer
287
Tolerances - spur gears, metric pitch
288
Total Toothcomp to Quality gS’’ Quality fS’’
error tooth Max Min Max Mincomp ind ind ind inderror reading reading reading reading
321
Trantorque
48 DP
Steel and Brass
Tolerances - spur gears 24 DP and finer
287
Tolerances - spur gears, metric pitch
288
Total Toothcomp to Quality gS’’ Quality fS’’
error tooth Max Min Max Mincomp ind ind ind inderror reading reading reading reading
Trantorque
48 DP
Steel and Brass
322
Tolerances - Spur Gears 4 DP to 20 DP
289
Max MinPitch indicator indicatorDP reading reading Tolerance
Spur gear durability and efficiency
290
Abbreviation Terms Unit To be found in
Trantorque
48 DP
Steel and Brass
323
Tolerances - Spur Gears 4 DP to 20 DP
289
Max MinPitch indicator indicatorDP reading reading Tolerance
Spur gear durability and efficiency
290
Abbreviation Terms Unit To be found in
324
Trantorque
48 DP
Steel and Brass
Spur gear durability and efficiency
291
Ruling Surface Core ThruMaterial BS No. Condition Section VPN BHN st BHN Sc Sb
Helical gear durability
292
No. IN MATING GEAR
teeth Rack 400 300 200 150 100 80 70 60 50 40 35 30 28 26 24 22 20 19 18 17 16 15 14 13 12 11 10
325
Trantorque
48 DP
Steel and Brass
Spur gear durability and efficiency
291
Ruling Surface Core ThruMaterial BS No. Condition Section VPN BHN st BHN Sc Sb
Helical gear durability
292
No. IN MATING GEAR
teeth Rack 400 300 200 150 100 80 70 60 50 40 35 30 28 26 24 22 20 19 18 17 16 15 14 13 12 11 10
Trantorque
48 DP
Steel and Brass
326
Spur and helical gear durability
293
No. No. teeth in gear being designed
teeth 400 300 200 150 100 80 70 60 50 40 35 30 28 26 24 22 20 19 18 17 16 15 14 13 12 11 10
rpm
Hours 0.1 1 5 10 40 100 150 200 400 500 600 1000 1500 2000 3000 5000 10000 20000 25000
Spur and helical gear durability
294
rpm
Hours 0.1 1 5 10 40 100 150 200 400 500 600 1000 1500 2000 3000 5000 10000 20000 25000
No. IN MATING GEAR
teeth Rack 400 300 200 150 100 80 70 60 50 40 35 30 28 26 24 22 20 19 18 17 16 15 14 13 12 11 10
Trantorque
48 DP
Steel and Brass
327
Spur and helical gear durability
293
No. No. teeth in gear being designed
teeth 400 300 200 150 100 80 70 60 50 40 35 30 28 26 24 22 20 19 18 17 16 15 14 13 12 11 10
rpm
Hours 0.1 1 5 10 40 100 150 200 400 500 600 1000 1500 2000 3000 5000 10000 20000 25000
Spur and helical gear durability
294
rpm
Hours 0.1 1 5 10 40 100 150 200 400 500 600 1000 1500 2000 3000 5000 10000 20000 25000
No. IN MATING GEAR
teeth Rack 400 300 200 150 100 80 70 60 50 40 35 30 28 26 24 22 20 19 18 17 16 15 14 13 12 11 10
328
Trantorque
48 DP
Steel and Brass
Spur and helical gears:assembly data, backlash calculations
295
Indicator Centre TotalNo. PCD Reading Dist Centre Comp.
Gear fp* Teeth DP Inches Max. Min. Tolerance Dist. Error
Maximum EquivalentCentre Distance ∆c Probable Max. Probable Max. Angularincrease over norm. B/Lash - fp* ∆c x 2tan PA) B/Lash. in Mins.
Simple calculation for strength
296
329
Trantorque
48 DP
Steel and Brass
Spur and helical gears:assembly data, backlash calculations
295
Indicator Centre TotalNo. PCD Reading Dist Centre Comp.
Gear fp* Teeth DP Inches Max. Min. Tolerance Dist. Error
Maximum EquivalentCentre Distance ∆c Probable Max. Probable Max. Angularincrease over norm. B/Lash - fp* ∆c x 2tan PA) B/Lash. in Mins.
Simple calculation for strength
296
Material Value of Mplastic 5,000bonze 10,000cast iron 12,0000.2% carbon steel natural 20,0000.2% carbon steel case hardened 25,0000.4% carbon steel natural 25,0000.4% carbon steel case hardened 30,000
Trantorque
48 DP
Steel and Brass
330
Rack tooth strength
297
Straight bevel gear:Formulae and definitions (Gleason System)
298
Term Definition Pinion Gear
Trantorque
48 DP
Steel and Brass
331
Rack tooth strength
297
Straight bevel gear:Formulae and definitions (Gleason System)
298
Term Definition Pinion Gear
332
Trantorque
48 DP
Steel and Brass
Straight bevel gear:Formulae and definitions (Gleason System)
299
Term Definition Pinion Gear
300
Material Factors
Character of load on driven machine
Prime Mover Uniform Medium HeavyShock Shock
Gear Pinion MaterialMinimum Minimum Factor
Material Hardness Material Hardness Cm
333
Trantorque
48 DP
Steel and Brass
Straight bevel gear:Formulae and definitions (Gleason System)
299
Term Definition Pinion Gear
300
Material Factors
Character of load on driven machine
Prime Mover Uniform Medium HeavyShock Shock
Gear Pinion MaterialMinimum Minimum Factor
Material Hardness Material Hardness Cm
333
Trantorque
48 DP
Steel and Brass
334301
Straight bevel gear:Torque, efficiency, assembly data
302
Right-angled gear systems-characteristics
Maximum Pitch LineMaximum Veicocity, ft/min.
Power-to- Effciency Ratio Hp Type of MountingClass Type Weight Ratio Range Range (per month) Commercial Aircraft Contact Sensitivity
Trantorque
48 DP
Steel and Brass
335301
Straight bevel gear:Torque, efficiency, assembly data
302
Right-angled gear systems-characteristics
Maximum Pitch LineMaximum Veicocity, ft/min.
Power-to- Effciency Ratio Hp Type of MountingClass Type Weight Ratio Range Range (per month) Commercial Aircraft Contact Sensitivity
OFF
SET
C
OPL
AN
AR
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
1 straight bevel medium high 97 - 99.5 1:1 to 8:1 500 1000 10000 line critical 3 directions 2 Coniflex bevel ¹ medium high 97 - 99.5 1:1 to 8:1 500 1000 10000 line critical 3 directions 3 spiral bevel very high 97 - 99.5 1:1 to 8:1 5000 8000 25000 line critical 3 directions 4 Zerol bevel ¹ high 97 - 99.5 1:1 to 8:1 1000 1000 10000 line critical 3 directions 5 Revacycle bevel ¹ high 97 - 99.5 1:1 to 8:1 100 1000 line critical 3 directions 6 Face gear medium high 97 - 99.5 3:1 to 8:1 200 4000 5000 line critical 1 direction 7 Beveloid ² low 97 - 99 1:1 to 8:1 150 4000 5000 point not critical 8 crossed helical low 50 - 95 1:1 to 100:1 100 4000 10000 point not critical 9 cylindrical worm medium high 50 - 98 3:1 to 400:1 750 5000 10000 line sensitive 2 directions 10 double enveloping worm medium high 50 - 98 3:1 to 100:1 1000 4000 10000 line or area critical 3 directions 11a hypoid low ratio high 85 - 98 1:1 to 10:1 1000 6000 10000 line critical 3 directions 11b hypoid high ratio medium high 50 - 90 10:1 to 50:1 500 6000 10000 line critical 3 directions 12 Face gear medium high 70 - 98 3:1 to 8:1 200 4000 5000 line critical 2 directions 13 Spiradrive 3 (spiroid) medium high 50 - 98 9:1 to 400:1 500 6000 10000 line sensitive 2 directions 14 planoid high 70 - 98 1.5:1 to 8:1 1000 4000 10000 line critical 3 directions 15 ZTA Spiradrive 3 medium high 50 - 98 3:1 to 400:1 500 6000 10000 line sensitive 2 directions 16 Beveloid ² low 70 - 98 1:1 to 8:1 150 4000 5000 point not critical
1 Zerol, Coniflex & Revacycle Gleason Works 2 Bevaloid Vinco Corp 3 Spiradrive, ZTA Spiradrive Davall Gears Ltd registered trade names
336
Trantorque
48 DP
Steel and Brass
Worm gear:Formulae and definitions (BS. 721)
303
Term Definition Worm Wheel
304
Worm gear: Torque capacity and effciency
337
Trantorque
48 DP
Steel and Brass
Worm gear:Formulae and definitions (BS. 721)
303
Term Definition Worm Wheel
304
Worm gear: Torque capacity and effciency
Trantorque
48 DP
Steel and Brass
338308
Bearings choice - spur and helical gears
309
Bearing choice - straight and spiral bevel gears
Tf × tan∞
Tf × tanPATf
Trantorque
48 DP
Steel and Brass
339308
Bearings choice - spur and helical gears
309
Bearing choice - straight and spiral bevel gears
340
Trantorque
48 DP
Steel and Brass
310
Bearing choice - straight and spiral bevel gears
Driving MemberValue of seperating component
Spiral hand Rotation* of radial load
Driving Member
Spiral hand Rotation* Value of axial thrust
311
Bearing choice - worm gearing
341
Trantorque
48 DP
Steel and Brass
310
Bearing choice - straight and spiral bevel gears
Driving MemberValue of seperating component
Spiral hand Rotation* of radial load
Driving Member
Spiral hand Rotation* Value of axial thrust
311
Bearing choice - worm gearing
