I. OBJECTIVE:
In this project, we will build and design an electric car with given materials. A motor and two AA batteries are the main sources of energy that make the car run without any manual help (using a hand to help it.)
II. EQUIPMENT:
- 1 pinion, 16 teeth, 0.070-inch bore
- 1 gear 60 teeth, 0.110-inch bore
- 4 polyethylene Wheels, Aluminum Chassis, Toy Car Tires and Wheels
- 2 AA Batteries, 2 Battery Holders
- 2 Axels, 3mm in diameter, 3-3/4"long, and 1 axels, 3mm in diameter, 2-3/4"long
- Double Sided Tape, styrofoam
- Switch, Motor, gold string, light green paper
- 4-40 1/2 inch machine Screw, 4-40 wing nut, #4 washers
- 1-hole conduit strap, type 3/4 TW
III. PROCEDURE:
- Place each of the axles of 3mm in diameter, 3-3/4"long through the holes on the chassis
- Alternately, connect 42/10 and 60 teeth gear to each of the axles.
- Make sure the teeth of the gears fit one another
- Place each of the wheels on the axles
- Place the motor that has the driver gear on the 42/10 gear
- Place into a hole conduit strap, type 3/4 tw, adjust if needed
- Place one washer, a screw and a wing nut in the hole in the conduit strap screw them in to hold the motor in place
- Place 2 pieces of double sided-tape at the middle if the car (other side of the motor), then place a battery holder on the top of the tape
- Put 2 AA batteries inside the battery holder
- After the battery holder had connected in series, connect the positive and negative to the switch
- Turn on and off to be sure the switch works,
- Put the cover of the car on the top of the chassis
- Now, you have a working car!!!!!!!!
IV. ANALYSIS:
Our main concern is that the car doesn't go fast enough while it carries the 12 ounces. Worst of all, it doesn't go straight because of the plastic wheel. We're trying everything we can think of, but it doesn't work. We're also worried, because we don't know our gear ratio. We don't even know how to calculate it. At least, we have our frame going well.
V. CONCLUSION:
Finally, we have finished building an electric car. Each of us have learned that by connecting the gear ratio correctly, the car will be able to carry a weight of 12 ounces, climb up a slope of 20 degree and 3 meter long with the fastest. We believe this is a good practice for the series circuit connection.