Check out the video to see how the gears move to turn the light on/off and also acts as the dimmer.
This was a result of a need for me to create an example GCSE Engineering project for my students and I really wanted to make something from scrap engine parts I bought of ebay.......Somehow I ended up with this, I am soooooooooooooo pleased with the outcome I thought I would share the joy :)
The project took me 4 days and cost less than £20......... best 20quid I ever spent :) I also like the fact that most of the main components are reused (gears, bearings, acrylic etc...) this keeps the cost down and encourages creative thinking.
I bought the following
Gears + crank + conrods + bearings - £2
Dimmer switch - £4
Braided flexi hose - £2
Transformer + bulb + holder £4
Acrylic - from a storage unit
Aluminium - offcuts donated to my school from local engineering company
Steel tube - offcuts from our scrap bin
Old speaker wire
Old 240v plug and double insulated wire
The more components you can harvest the better, look in junk yards / boot sales / garage sales / or even look for instructables treasure in your own garage......you will be surprised what you can find, we all keep stuff as one day it might be useful.....guess what this is that day :)
Please note this instructable's dimensions and working drawings are based around the gear box I used (from an FJ 1200) its likely you will have different components and will have to tweak the dims/drawings/design to fit your materials.