Blog
Notes on design, builds, and behind-the-scenes from Contraption Cart.
How Does a Writing Automaton Work?
Learn how mechanical writing automatons work — gimbal, pantograph, and cam mechanisms explained, with a free cam generator app and DIY Lanky Doodler Writing Automaton kit.
How Does a Mechanical Calculator Work?
Learn how a wooden mechanical calculator works — carry operation, place-value dials, and gear mechanisms explained, with step-by-step multiplication and division on a DIY math toy kit.