Assemble cam mechanisms | Design and technology | Quizalize & Oak National Academy

Starter quiz

What is a hacksaw used for?
- measuring
- strengthening
- holding
- cutting ✓
Which of these is true about softwood?
- it grows slowly
- it is easy to cut and shape ✓
- it has a tight grain
- it is more expensive
Which type of cam causes the follower to make a sudden drop?
- ellipse
- pear
- eccentric
- snail ✓
Why would a triangle be added to a corner joint?
- to strengthen it ✓
- to decorate it
- to measure it
- to join it
Which of these is not a safe way to use a hacksaw?
- Keep fingers away from the blade.
- Hold the blade up high when walking. ✓
- Point the blade down to the floor when walking.
- Use a bench hook to support wood.
- Hold the saw by the handle.
Match the parts of an automaton cam mechanism to their function.
- cam disc
  
  ⇔
  
  affects the movement of the follower ✓
- slide
  
  ⇔
  
  supports the follower ✓
- axle
  
  ⇔
  
  rotates the cam discs ✓
- follower
  
  ⇔
  
  moves an animated element ✓
- crank
  
  ⇔
  
  turns the axle ✓

Exit quiz

What is a component?
- a mechanism
- an automaton
- an individual part ✓
- a frame
What type of movement does a snail cam make?
- up and down
- jagged
- small pause
- sudden drop ✓
Which part of a drill holds the drill bit?
- handle
- chuck ✓
- crank
- body
The followers on a cam mechanism sit __________ the cam discs.
- below
- above ✓
- beside
- underneath
Which word means to 'bring together individual parts'?
- assemble ✓
- disassemble
- resemble
- component
Why do axles at a 90-degree angle to the followers produce a more effective movement?
- stronger joints
- more space to move
- better connection to the cam ✓
- easier to see the movement

Worksheet

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Presentation

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Lesson Details

Key learning points

Axles at 90 degree angles will allow more accurate connection to the cams.
More than one cam can be added to the same axle.
Designs may require loose fit or tight fit joints.
Drilling techniques need to be conducted safely.

Common misconception

Drilled and pierced holes can be any size.

Cam discs need to be tightly fitted to the axle so that they rotate with it. Holes for the axle and followers need to be loose to allow free movement.

Keywords

Assemble - bring separate parts together
Components - separate parts of a larger whole
Drill bit - cutting tool used to make holes
Chuck - a device for holding a tool in place