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Three Mechanical Puzzles by James Bennett

The kids in my summer class loved to take apart VCR’s, record players and typewriters, but I didn’t want them to come away with the idea that you only took things apart. I began looking for simple mechanical devices kids could take apart, see how they worked, and then put back together. Then the obvious occurred to me: how alike puzzles and mechanical things are. Many people like puzzles but are intimidated by machinery. I had never liked puzzles, yet I liked to work on machinery. Ironic. Weren’t they really similar? Why not use real mechanical objects as puzzles to expose kids to simple machinery? Maybe then they would be less intimidated by leaky faucets and machinery when they were older. Their puzzle knowledge could have practical applications.

The Faucet

At the hardware store I choose an eight piece brass gate valve, or faucet, about 8†tall. Kids like the feel and size of it. Smaller faucets don’t have the same attraction. They like to turn the handle and watch the gate inside the faucet open and close. I took this faucet apart and traced each piece, in the order it came apart, on a piece of felt. The activity was for children to take the faucet apart, match the pieces to the proper shapes on the felt and then put it back together. After they could reassemble the faucet using the felt, I had them put the felt away and try again still arranging the pieces in order as they came apart. This is a good lesson when taking anything apart: arrange the parts in order as they come apart. After kids can assemble the facet without the felt I’ll sometimes challenged them to mix the pieces up and try again. If they need help they can always go back to the felt.

The most interesting reaction to the faucet puzzle, however, came from a teacher. I had volunteered to take my puzzle collection, some folk toys, and some science equipment to a friends classroom. I spread everything out and let the kids choose their own work. The faucet was on one table and the teacher asked what you did with it. First I showed how the gate opens when the handle is turned and then I told her it was to take apart and put together. So she did. She was excited and exclaimed to the kids around her â€look at this, see how it works!†She was lost in the mechanics of a faucet. The principal came in. Julie, the teacher, said, â€Rob come over here and see this.†Rob had other things on his mind and wasn’t really interested but Julie made him come over and listen to her explain how a faucet worked. While we don’t all get that excited about faucets, by merely taking apart and reassembling the faucet Julie was able to make a small part of the mechanical world less intimidating.

The Door Lock
At a garage sale I found a flat square door lock from an old house. I cleaned it up and replaced one side with a piece of Plexiglas so the inner lock mechanism was visible. It was hard not to appreciate how the parts fit together and worked. What happens when the door knob is turned and released? How does this open the door? How does the lock part work? Why will one key work and not another?
Back in class I set the lock on the table with some other science things to see if anyone was interested. To my surprise no one was. I didn’t understand why until I realized kids didn’t see the individual lock pieces. It was all one unit to them. I took the lock home and painted the inside white and each working piece a different color. Then I set the lock in a mini-door frame. What a difference! Everyone was interested and amazed. Parents would ohs and ahs and the kids would sit down and work with it till the lock opened and they could understand how it worked. Some could even pick the lock with a paper clip.

The Lawn mower engine
At the Smithsonian Institution I had seen a motorcycle engine with part of the engine block and cylinder head cutaway so the piston, crankshaft and valves could be seen. I thought it might be interesting to take this exhibit a step further by having an engine kids could actually take apart an put back together. I found an engine, disassembled it and steam cleaned the parts at a car wash. I cut a wedge shaped piece from the engine block to make the piston visible and removed a matching piece from the cylinder head. I removed another piece from the lower engine block to expose the crankshaft., painted some of the parts and reassembled the engine.

My son’s teacher found five interested kids and we went to the cafeteria to test this creation. They really liked to take it apart but when it came to putting it back together they weren’t very interested. I found myself getting upset because they were losing pieces and didn’t want to listen when I expounded on how a internal combustion engine works.

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Article Source: http://www.earticlesonline.com/Article/Three-Mechanical-Puzzles/875260

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