Machining is any of various processes in which a piece of raw material is cut into a desired final shape and size by a controlled material-removal process. All such processes are well known as subtractive manufacturing and should be clearly distinguished from the processes of controlled material addition.
The three main machining processes are classified as turning, drilling and milling, other operations falling into miscellaneous categories include shaping, planing, boring, broading and sawing.
Turning operations are operations that rotate the workpiece as the primary method of moving metal against the cutting tool. Lathes are the principal machine tool used in turning.Milling operations are operations in which the cutting tool rotates to bring cutting edges to bear against the workpiece. Milling machines are the principal machine tool used in milling.Drilling operations are operations in which holes are produced or refined by bringing a rotating cutter with cutting edges at the lower extremity into contact with the workpiece. Drilling operations are done primarily in drill presses but sometimes on lathes or mills.
Miscellaneous operations are operations that may not be machining operations in that they may not be swarf producing operations but these operations are performed at a typical machine tool. Burnishing is an example of a miscellaneous operation. Burnishing produces no swarf but can be performed at a lathe, mill, or drill press.
Currently we have CNC Lathes, High Precision Automatic Lathes, Pneumatic Control Punches, Digital Control Millers, Automatic Chamfer Cutters, Tapping Machines, Drilling Machines, Centerless Grinders, Magnetic Abrasive Machines, Ultrasonic Cleaners, Shearers, Engine Lathes, Assembly Lines, Anodizing Tanks, Passivation Lines, Heat Treatment Lines etc.
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