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a 20-tooth follower will turn threetimes as fast as a 60-tooth driver.(Speed ratio: 3 : 1)a 60-tooth follower will turn once forevery three turns of a 20-tooth driver.(Speed ratio: 1 : 3)This gear train can be used toincrease speed and decrease force.= Gearing upThis gear train can be used todecrease speed and increase force.= Gearing downGearing up means the followerturns faster than the driver.Gearing down means the followerturns slower than the driver.18
Working out revolutions per minute ( rpm )If A revolves at 120 rpm,what is the rpm of B ?19
Page 4: Pawl and ratchetA ratchet mechanism
Page 8 and 9: Meshed GearsThe diagram below shows
Page 10 and 11: 2) Dividing the diameter of the fol
Page 12 and 13: ExercisesLook at the image on the l
Page 14 and 15: Gear ratios and simple gear trainsW
Page 16 and 17: What is the Gear ratios of these Ge
Page 20 and 21: Working out revolutions per minute
Page 22 and 23: Working out revolutions per minute
Page 24 and 25: Question 1For every revolution of t
Page 26 and 27: BicyclesMany machines usegears. A v
Page 28 and 29: Highest gear: (downhill) is the lar
Page 30 and 31: Changing the angle of motionBevel g
Page 32 and 33: Movement of the rack & pinionNote:
Page 34 and 35: The Wheel Although they may seem ve
Page 36 and 37: To understand torque you need to kn
Page 38 and 39: Gear torque rules:Torque is a turni
Page 40 and 41: A simple gear train consists of two
Page 42 and 43: Mechanical AdvantageWhen two gears
Page 44 and 45: Question 1Look at the imageon the l
Page 46 and 47: Answers p 12:46
Page 54 and 55: 1. Bevel Gears:a. Have teeth parall

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