Cam mechanisms | Design and technology | Quizalize & Oak National Academy

Starter quiz

What type of mechanism do you see in this image?
- pulley
- slider
- wheel and axle ✓
- lazy-tong
Match these words to the description.
- axle
  
  ⇔
  
  a rigid bar ✓
- wheel
  
  ⇔
  
  a circle shaped component ✓
- fixed axle
  
  ⇔
  
  axle stays in one place, the wheel moves around it ✓
- free-moving axle
  
  ⇔
  
  axle and wheel are attached and move together ✓
Which of these are properties of wood?
- man-made
- easy to shape ✓
- transparent
- insulator ✓
Match these types of movement to the descriptions.
- linear
  
  ⇔
  
  movement in a straight line ✓
- rotary
  
  ⇔
  
  movement in a circle ✓
- reverse
  
  ⇔
  
  movement in the opposite direction ✓
- parallel
  
  ⇔
  
  movement in the same direction, never meeting ✓
Which of these joining methods would be most suitable to allow the individual parts of a model to move?
- glue
- split pins ✓
- staples
- sticky tape
What does input mean?
- the effort required to start a machine or mechanism ✓
- the movement a mechanism makes
- an end result or outcome
- part of a mechanism

A cam turns rotary motion into which other type of motion?
- 'linear' ✓
What does reciprocating mean?
- moving round in a circle
- swinging back and forth
- repeated linear motion ✓
Which of these is an eccentric cam?
What happens to a follower when the widest part of a cam reaches the top of the axle?
- it drops down suddenly
- it moves down
- it moves up ✓
- it stops
What is a prototype?
- an idea
- a drawing
- a finished product
- a model or mock-up ✓
Which part of the cam mechanism is indicated in this image?
- 'The follower' ✓

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Cams usually convert rotary motion into linear motion.
Rotary motion is movement that goes round.
Oscillating motion is moving to and fro around a pivot point, as in a lever.
Reciprocating motion is a backwards and forwards movement in a straight line, as in a slider.

All cams create the same movement.

The size, shape and position of a cam will create different types of movement.

Cam - a mechanism that changes one type of movement to another
Rotary - movement that goes round in a circle
Linear - movement in a straight line
Reciprocating - backwards and forwards movement in a straight line, as in a slider
Oscillating - moving back and forth along a curved path