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EducateNXT Gearing LEGO parts required for gearing activities: GEARS 24 teeth (or 24-tooth crown) 40 teeth 8 teeth AXLES 16 x 1 LEGO Brick Bushings

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EducateNXT Gearing A B If Gear A turns clockwise, which way will Gear B turn? Using any two gears with the same number of teeth, make the following gear system.

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EducateNXT ABC Gearing If Gear A turns clockwise, which way will Gear C turn?

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EducateNXT A 40 teeth B 40 teeth Gearing How many times will you need to turn Gear A so that Gear B turns one rotation?

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EducateNXT B 40 teeth A 8 teeth How many times do you have to turn Gear A to turn Gear B one rotation? Gearing You should get five times.

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EducateNXT A 24 teeth B 40 teeth Gearing Before you make this gear train, predict how many times you will need to turn Gear A in order to turn Gear B one rotation. Now make it and check your answer. You should get a little more than 1.5 times.What is the exact gear ratio?

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EducateNXT 3 times 1.67 times A 8 teeth B 24 teeth C 40 teeth GEAR RATIO Gearing Multiple simple gear ratio = 3 x 1.67 = 5 Check to see that five turns of Gear A will cause one turn of Gear C.

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EducateNXT Compound Gearing A compound gear ratio is the total multiplied gear ratio of all gears in a gearbox. It works by having a smaller gear on the same axle as a larger gear.

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EducateNXT Compound Gearing Construct the above compound gear train with three axles.

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EducateNXT 3 3 Compound Gearing Total gear ratio = 3 x 3 = 9 Check to see if 9 turns of A = 1 turn of B A B

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EducateNXT Now make your own compound gear ratio. How big a gear ratio can you come up with? Compound Gearing Heres one way to do it.

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EducateNXT Resources Gears have been drawn using EasiDraw Gear for Microsoft Word. www.myeasidraw.com www.myeasidraw.com LEGO piece diagrams in Slide 1 from www.peeron.com www.peeron.com

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EducateNXT

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