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Lab 6 P. 1
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
Gears
Lab 6
Lab 6 P. 2
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
Gear: Definition
• A gear is a wheel with teeth along its rim. • It is used to transmit effort from one shaft to
another.
Lab 6 P. 3
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
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.
Lab 6 P. 4
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
Gear Ratio
• Gear ratio is also called “Mechanical Advantage”
Gear ratio Number of Driver Teeth
Number of Driven Teeth
Lab 6 P. 5
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
Types of Gears• Spur gears
• Worm gear
• Rack and pinion
• Bevel gears
Lab 6 P. 6
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
Spur Gears
• Simplest• Most widely used in Instrumentation and Control
Systems• Used to drive parallel shafts
Lab 6 P. 7
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
Spur Gear Terminology
• Pitch circle diameters• Size of teeth (Diametral pitch)• Center distance• Number of teeth• Pinion• Gear
Lab 6 P. 8
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
Worm Gears
• Used to change speed and direction of rotation. • Used for connecting skew shafts (usually 90
degrees)• High gear ratios.• Higher load capacity.
Lab 6 P. 9
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
Rack and Pinion
• Used to convert rotational motion into linear motion, or vice-versa.
Lab 6 P. 10
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
Bevel Gears
• Used for intersecting shafts.• Most transmissions occur at right angles but
shaft angles can be any value.
Lab 6 P. 11
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
Sprockets
• Gears are connected by a chain instead of directly.
• The input and output shaft rotations are in the same direction.
Lab 6 P. 12
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
Today’s Lab:
• Window Lift Motor• Lego Robot Gripper• Gears at Table• Build Gearbox• Bicycle Gears
Lab 6 P. 13
Engineering H191 - Drafting / CAD
Autumn Quarter Gateway Engineering Education Coalition
Questions ?