Joining parts by riveting
A riveted joint is used to join flat parts laid one on another. It is widely used in aircraft, shipbuilding and bridge-building, and is also useful for joining sheet metal. A rivet is a rod with a head of various shapes, made by stamping from a ductile metal such as soft steel, copper or aluminium. Types include round-head, countersunk, flat-head and conical-head. Riveting order: the parts are laid together and a hole is made (the hole must fit the rivet snugly); the rivet is put through and its head rested on a base; the parts are drawn together with a rivet set under hammer blows; the protruding end is flattened and a closing head is formed with a rivet snap. Drilling and hammering are done the way the teacher shows, in goggles, with hands out of the line of the blow.
Paper model: lay two card strips together; after an adult makes a hole (with a hole punch, not a needle), join them with a paper brad (split pin). Do the strips swing? How could the joint be made rigid? Think and write. Work only with paper.