Archive for November, 2009
Let’s make the Moto Magic, a tin can that moves motored by energy from an elastic. Imagine it to be a helicopter, windmill or madly rotating drum. Decorate the can with colourful electrical tape and it will make nice patterns when twirling around….. Amaze your friends!
You can also make the piece just long enough to stick inside the open end and then use two small nails from the side to fix it in place. The only problem with this is that when the elastic breaks after lots of use, you have some difficulty replacing the elastic. But when that happens you might find a solution yourself. Have fun anyway!
The driver is an elastic that is fixed at the bottom and the top of the can, look at the photos how this is done. Make sure that the stick only rubs on the washer, IT SHOULD RUN FREE OFF THE RIM , otherwise your have too much friction. Put a little vaseline between the washer and the tin can to lubricate the parts and reduce friction, the Moto Magic will run much longer and goes faster with the least friction!
Maybe you have a hand held bicycle pump? Well this is one you can make yourself! When it is done, you can experiment with it. When you FORCE the PISTON in to the tube you do WORK, While the other end of the tube is closed off by the cork, you compress the air inside. Your work is stored in the compressed air as POTENTIAL ENERGY. What is so “potential” about this you might ask? Well when the cork pops out of the other end the compressed air escapes suddenly with a loud “POP”, the potential energy becomes suddenly SOUND ENERGY. When the sound is gone your hard work or energy you put in the pump has disapeared in the great blue yonder of the universe. Wow, just try it again, if you do this many times you get a good WORK-out which makes you energetic!
These materials can be scrounged from an electrician and wood worker, most hobbyists also would have some of these pieces for you. If you explain what you would like to make, most adults would help you as best they can!
You need a piece of plastic electrical tube, what the trades people call 3/4 inch electrical conduit. It should be about 30 cm long. A piece of wood, same length and less than 2 cm square with the edges removed by carving or planing so that it fits easily into the plastic tube. You need a cork that fits in the tube and a string. A leather disc the size of a Canadian five cent piece, it should fit tightly iinto the plastic tube, use some vaseline to grease it. A roofing nail is perfect for nailing the leather disc to the end of the wooden stick. Use electrical tape for decoration and construction, for example fixing the string to the tube and to the cork.
We made the leather discs by using a punch, just a piece of steel tubing that we filed or ground at one end to make a sharp edge and then used this as a punch, see the piece of leather with the holes in it, the punch is beside it. But you can use scissors to cut your disc, MAKE SURE YOU HAVE AN ADULT HELPING YOU WITH THE CUTTING!!! Safety first!