Ключевые слова: abrasive, accuracy, background, blade, borer, business, circle, circular, closeup, corundum, diamond, disc, disk, drill, engineering, equipment, fabric, factory, grinding, grindingmetal, grindstone, hand, industry, laborer, lathe, machine, machining, manufacturing, mechanical, metal, metalwork, polishing, power, production, rotation, saw, sharpening, sparks, speed, steel, stone, strength, surface, technology, tool, water, welding, wheel, work, worker,