Mechanisms Module main features
It is an Assessment for Learning resource for KS3 and KS4.
It includes all the theory notes, exercises and animations that students need to learn about mechanisms in design and technology courses. There are PDF versions of all the technology theory and exercises.
There are 21 exercises + 2 interactive tests:
- a multiple choice test which may be used as a start of module test to assess prior knowledge of mechanisms
- a test with input fields which may be used as an end of module test to assess the level of new knowledge of mechanisms.
Both types of test give feedback and score.
Animations and technology theory in the Mechanisms Module
- mechanical systems and subsystems: example mechanical systems, mechanisms used on a bicycle
- cams, rotary and linear, cam followers
- chain and sprocket drive
- roller chain parts
- leaf chain parts
- special chains
- couplings
- flanged
- split
- flexible
- universal joint
- crank mechanisms
- crank and slider
- friction used to oppose motion:
- brakes
- clamps
- grips / knurling
- reducing friction by the use of lubricants and bearings
- lubrication
- bearings:
- plain bearing / bush
- ball bearing
- cylinder roller bearing
- needle roller bearing
- spherical roller bearing
- taper roller bearing
- thrust bearing
- Gears:
- transmitting motion and force
- spur gears, wheel and pinion
- simple and compound gear train
- bevel gears
- worm gear
- rack and pinion
- velocity ratio
- gear shaft velocity
- levers: Class 1, Class 2, Class 3, bell crank lever, cantilever.
- linkages
- moments / torque
- motion: types of motion
- pulleys and belts:
- used to transmit motion and torque
- change speed of rotation
- stepped cone pulleys
- pulley belts used to transport products and people
- pulley belts used as bandsaws
- pulleys used for lifting and hauling
- ratchet and pawl
- springs
- compression spring
- tension spring
- torsion spring
- clock spring
- leaf spring
- materials used for springs
- Screws
- nuts, bolts screws
- types of nuts, bolts and screws
- cutting screw threads
- common thread forms
- motion control: using screws to control motion
- ball screws
- roller screws
- application of screw mechanisms for clamping, controlling movement, for lifting.
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