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Making DIY Gears
DISCLAIMER AND SAFETY PRECAUTIONS
Gears are used in all sorts of machinery and devices such as vehicles, bicycles and clocks. These tools all have an initial motion that is carried on to other moving parts through the use of gears. At the beginning the students should engage in the use of gears by talking about some facts about gears. Students should then watch this short video about gears on youtube. https://www.youtube.com/watch?v=rFQR996cxck (1.23-3.48) the video explains the physics involved in transferring an initial force from one gear to another.
Use the given materials to make a gears. The aim of the exercise is to simply make working gears to display the transfer of energy.
To promote diverse solutions amongst the students the instructions are not a step by step guideline to designing and building the gears but open ended process so that each student creates their own bridge. However, for a younger group that may struggle to come up with their own ideas for gears, use the step by step instructions from the link above.
Searching the internet for videos and images are allowed for inspiration. The images above display variations of gears that can be made from cardboard.
Design your gears on paper. Decide the size of the gears, the number of gears and how you will create or mimic the teeth of the gears.
Cut the designed shapes out from the cardboard pieces.
After cutting out the frame of the gears, assemble it first then assemble the gears and place them onto the frame.
Add any last few materials, for example the rod or pins used to exert the rotation of the gears
Test out your gears.
If things don’t work out, try and change some of the pieces by recutting or reshaping them.
All students should present their gears explaining their findings and what they viewed as the gears rotated.