Human Factor in Aircraft Maintenance

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------------------------------------------------- MACHINE TOOLS ------------------------------------------------- ------------------------------------------------- Milling machine. ------------------------------------------------- A milling machine is a machine tool used to machine solid materials. * Milling machines are often classed in two basic forms, horizontal and vertical, which refers to the orientation of the main spindle. * Milling machines also move the work piece radically against the rotating milling cutter, which cuts on its sides as well as its tip * Cutter movement are precisely controlled to less than 0.001 in (0.025 mm), usually by means of precision ground slides and lead screws or analogous technology * Milling machines may be manually operated, mechanically automated, or digitally automated via computer numerical control. * Milling machines can perform a vast number of operations, from simple (e.g., slot and keyway cutting, planning, drilling) to complex (e.g., contouring, die sinking). Computer Numerical Control (CNC) Drilling | | * Computer Numerical Control (CNC) Drilling is commonly implemented for mass production. * The drilling machine, however, is often a multi-function machining center that also mills and sometimes turns. * fastest machines for drilling varying hole sizes have multiple spindles in turrets with drills of varying diameters already mounted for drilling * The appropriate drill is brought into position through movement of the turret, so that bits do not need to be removed and replaced. ------------------------------------------------- Grinding machine * A grinding machine, often shortened to grinder, is a machine tool used for grinding, which is a type of machining using an abrasive wheel as the cutting tool * Each grain of abrasive on the

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