Build a motorized robot, race car, and countdown timer — all that run without any batteries or electrical power!
The secret behind these fascinating machines is a power source called a mainspring — a spiral-shaped spring that stores up energy when wound up by hand, and then converts that stored energy back into motion when it discharges. The mainspring inside the robot turns gears which enable it to march forward on two legs. The race car zooms across the floor as its mainspring uncoils and turns its wheels. The countdown timer uses a more complex system of springs, gears, ratchets, and linkages to slowly tick down the seconds as it discharges — for a countdown of up to six minutes. As you assemble these models one at a time from over 130 pieces, you will learn about the inner workings of spring-powered devices like wind-up toys and ticking mechanical clocks.
Discover the physics concepts of potential and kinetic energy as you experiment with your spring-powered machines. Easy, snap-together assembly requires no glue. The kit includes step-by-step illustrated instructions.
+ 3-in-1 engineering kit: build three self-powered models, then wind them up and watch them go!
+ Learn about potential and kinetic energy and how gears and springs function in different mechanical devices.
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What is a small part?
A small part is any object that fits completely into a specially designed test cylinder 2.25 inches long by 1.25 inches wide that approximates the size of the fully expanded throat of a child under three years old. (See figure). See 16 C.F.R. 1501.4 A small part can be:
A whole toy or article
A Separate part of a toy, game, or other article
A piece of a toy or article that breaks off during testing that simulates use or abuse by children
If a small part fits completely into the cylinder, and the toy or product from which it came is intended for use by children under three, the toy or product is banned because the small part presents a choking hazard.
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