jigs and fixtures

jigs and fixtures, Components of machine-tool installations, specially designed in each case to position the workpiece, hold it firmly in place, and guide the motion of the power tool (e.g., a punch press). Jigs can also be guides for tools or templates, as in the furniture industry. Special cramping jigs that ensure squareness are set up so that, for example, a wardrobe can be glued up in one operation by power-driven rams. See also assembly line, interchangeable parts, mass production.