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Gears Lab 6 Before we begin… Pre-assembled Lego materials SHOULD NOT be taken apart. Lego Gripper, Steering Assembly, Differential Assembly Disassembling any of the pre-assembled examples will result in a 10-point deduction on your lab report grade.

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Gears

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Gears

Lab 6

Autumn Quarter


Before we begin…

  • Pre-assembled Lego materials SHOULD NOT be taken apart.

    • Lego Gripper, Steering Assembly, Differential Assembly

  • Disassembling any of the pre-assembled examples will result in a 10-point deduction on your lab report grade.

  • Follow directions! Only take objects apart when told to and when you have put them together to begin with.

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Gear: Definition

  • A gear is a wheel with teeth along its rim.

  • It is used to transmit effort from one shaft to another.

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Gear Train

  • Combination of two or more meshed gears. Used to change the rate of rotation, the direction of rotation, and the amount of torque.

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Gear Ratio

  • Gear ratio is also called “Mechanical Advantage”

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Types of Gears

  • Spur gears

  • Worm gear

  • Rack and pinion

  • Bevel gears

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Spur Gears

  • Simplest

  • Most widely used in Instrumentation and Control Systems

  • Used to drive parallel shafts

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Spur Gear Terminology

  • Pitch circle diameters

  • Size of teeth (Diametral pitch)

  • Center distance

  • Number of teeth

  • Pinion

  • Gear

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Worm Gears

  • Used to change speed and direction of rotation.

  • Used for connecting skew shafts (usually 90 degrees)

  • High gear ratios.

  • Higher load capacity.

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Rack and Pinion

  • Used to convert rotational motion into linear motion, or vice-versa.

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Bevel Gears

  • Used for intersecting shafts.

  • Most transmissions occur at right angles but shaft angles can be any value.

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Sprockets

  • Gears are connected by a chain instead of directly.

  • The input and output shaft rotations are in the same direction.

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Today’s Lab:

  • Window Lift Motor

  • Lego Robot Gripper

  • Gears at Table

  • Build Gearbox

  • Bicycle Gears

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Questions ?

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