This is a design engineering project for an 8th grade class studying force and motion. They will design the body of a car that will run on some Hot Wheels track. They will use round toothpicks as axles for the car. A hole 3 mm hole through the body of the car (print body on its side) will fit the toothpick axle nicely. The wheels will have 2.2 mm holes to accommodate the toothpicks. A larger hole (2.5 mm) in the wheel will also work if you use a bit of clay to hold the wheel in place on the axle. I bought a box of Hot Wheels track for cheap on eBay a few years ago.
This project was successful. The students were able to make cars that run fast on the Hot Wheels track and measure their speed.
Getting the wheels on the toothpicks is a bit fidgety. A tool to ream out the hole in the wheel is useful, and they don't manufacture toothpicks to a high standard of uniformity, so some were square, or thicker / thinner than average. I ended up putting all the wheels on, which didn't take a lot of time. If the students do it watch out because they will tend to try and push the toothpick straight into the hole and stand a good chance of snapping it and maybe stabbing themselves. Holding the toothpick near the end going into the wheel and twisting works well.
| 3DPrintaToyCarNEW.pdf | 51.8KB | |
| aidan.stl | 33.8KB | |
| alyssa.stl | 6.2KB | |
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| body.stl | 5.7KB | |
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| Wheel.stl | 8.7KB | |
| wheel_15mm.stl | 8.7KB | |
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| wheel_25mm.stl | 8.7KB | |
| william.stl | 12.5KB |
