Technology

• White Table Tops• Work Book• Text Book• Pen or Pencil• Start when Quiet

Technology

• Motion Transmission• Motion Transformation• Wind Turbine

Motion Transmission Systems

• Characteristics• Construction• Speed Changes • Torque

Workbook p. 225Textbook p. 435

Definitions

Motion Transmission:

• Is the mechanical function of relaying a motion from one part to another without altering the nature of the motion

A Motion Transmission System:

• Is a set of components that perform the function of transmitting motion

Types of Components

Driver Component

• Component that receives the force required to activate the system

Driven Component

• Component that receives the motion and transfers it to another part

Intermediate Component

• Component located between the driver and driven components. Not all systems contain an intermediate component

Characteristics

Gear Trains

Direction

• Alternates from one gear to another

Reversibility

• Yes

Chain and Sprocket

Direction

• Identical only for the sprockets touching the same side of the chain

Reversibility

• Yes

Worm Gear

Direction

• Depends on the direction of the threads on the worm screw shaft

Reversibility

• No

Friction

Direction

• Alternates from one gear to another

Reversibility

• Yes

Belt and Pulley

Direction

• Identical only for pulleys touching the same side of the belt

Reversibility

• Yes

Motion Transformation

p. 231

Motion Transformation

• Is the mechanical function of relaying a motion from one part to another while altering the nature of the motion

Rack and Pinion

Possible Transformation• Rotation => Translation• Translation => Rotation

Reversibility• yes

Rack Pinion

Screw Gear Type 1

Possible Transformation• Rotation => Translation

Reversibility• No

FIXED

Screw Gear Type 2

Possible Transformation• Rotation => Translation

Reversibility• No

NOT FIXED

Cam and Follower

Possible Transformation• Rotation => Translation

Reversibility• No

Slider-Crank

Possible Transformation• Rotation => Translation• Translation => Rotation

Reversibility • Yes

Homework

pp. 225-238

Activity # 1

• Get a partner

• Paper and Pencil / pen

• Rotate clockwise around the classroom