Power toolA power tool is a tool that is actuated by an additional power source and mechanism other than the solely manual labor used with hand tools. The most common types of power tools use electric motors. Internal combustion engines and compressed air are also commonly used. Tools directly driven by animal power are not generally considered power tools. Power tools are used in industry, in construction, in the garden, for housework tasks such as cooking, cleaning, and around the house for purposes of driving (fasteners), drilling, cutting, shaping, sanding, grinding, routing, polishing, painting, heating and more.
Numerical controlNumerical control (also computer numerical control, abbreviated CNC) is the automated control of machining tools (such as drills, lathes, mills, grinders, routers and 3D printers) by means of a computer. A CNC machine processes a piece of material (metal, plastic, wood, ceramic, stone, or composite) to meet specifications by following coded programmed instructions and without a manual operator directly controlling the machining operation.
Valeur instrumentale et intrinsèqueEn philosophie morale, la distinction entre valeur instrumentale et intrinsèque est la distinction entre ce qui est un et ce qui est une . Les choses sont considérées comme ayant une valeur instrumentale si elles aident à atteindre une fin particulière ; les valeurs intrinsèques, en revanche, sont considérées comme souhaitables en elles-mêmes. Un outil comme un marteau a une valeur instrumentale car il aide à enfoncer un clou, de même pour une machine à laver car elle aide à laver des vêtements.
