The refrigerator at home which helps preserve food and keep it safe for consumption for an extended amount of time is a machine. A sewing machine used to provide one of the most basic needs, clothing, is a machine. Compressors, cranes, engines , hoists, polishing equipment, printing presses, pumps, turbines and watches are all machines.
Machines are needed to create other machines. These machines are called machine tools which are primarily used to shape materials or work pieces into special forms and shapes. Modern machine tools are automated. Large-scale machining operations use computers to monitor operation sequences.
Boring machines, drill, presses, lathes, milling machines, planers and sharpeners are examples of machine tools. The development of stronger and more durable material for work pieces has forced many machine tools to evolved. Laser cutters are one of the modern machine tools used for materials that the more traditional machine tools are incapable of cutting.
Robots are among the most sophisticated machines which are commonly used in mass production assembly lines. These advanced machines perform tasks with utmost accuracy and care. A robot is able to pick up a work piece, put it in proper position, perform a desired machining operation and then send the work piece along the assembly line for further processing.
Despite its advantages in terms of efficiency and quality, the complexity involved in the maintenance of robots makes it impractical for low volume operations.