ShopReady Draft 3D · 3:04 · narrated, with captions

A small engine that turns over

A crank disc on its shaft, a connecting rod, a piston on its pin and a block open on top, all drawn in one flat drawing with every size typed, pulled into five parts, pinned on the flat plan and given a motor. The crank goes round and the piston slides in its bore, seen in 3D from every side.

Before thisA Geneva wheel: it steps, then stands still

This is one part of a longer film

Film · 13:59

Things that move in 3D

Things that move: gear trains, a small engine and a Geneva wheel, each built and set turning.

More in Things that move: links, cranks and cams

Clip · 3:12

A Geneva wheel: it steps, then stands still

A wheel with four slots and a driver with one pin and a locking disc. Both outlines are made in the flat drawing by cutting simple shapes out of circles, then pulled into three parts and pinned on the flat plan. Nothing joins the wheel to the driver: the pin turns it a quarter turn by touching it, and the locking disc holds it still until the pin comes round again.