Discover how worm gears are used to greatly lower rotational speed and how screws can convert circular to linear motion while greatly increasing force. By constructing five working models and reading the explanations provided, you'll master the engineering of screws. Instructions and materials provided to construct a screw press, folding lifting platform, two cranes, and a vice. A 36 page activity book is included with innovative experiments and detailed explanation of the different technological principles applied. Reccomended ages 8 and up.
WARNING: Choking Hazard - Small parts..Not for children under 3 years.