Machining is a part of manufacture of all kinds of metal products. Metal machining is a combination of various processes involved in using different tools like drill presses, milling machines and lathes to remove and process materials. A sharp cutting tool is used to get the desired geometrical shape from the metal. People may do this as a hobby or as a part of their job.
The various operations range from drilling, milling, turning, broaching, boring, planing, sawing and shaping, the most common one being drilling.
Drilling involves making or refining holes on a metal. The drill press or a tool containing rotating cutters is used for this purpose. Milling is the process where a cutting tool is used to straighten up the surface. Peripheral and face milling are done slowly to remove the cutting edges that help get the investment casting china metal to the desired shape. The cutting tool used for turning metal contains a single cutting edge and is used to bring in a cylindrical shape to the metal.
Sawing is done with a hard blade or wire with an abrasive or serrated edge. This can be done by hand, or powered by steam, water, electricity etc. It is used for cutting hard metals. The shaping or planing machine is used to straighten and flatten surfaces.
Boring or reaming is a process used for enlarging or make the dimensions of the hole more accurate after the drilling process. Tapping and dieing are the processes where tools are used to create screw threads. Grinding is also an abrasive machining process that uses grinding wheel and cutting tool. Grinding produces very fine finishes and very accurate dimensions.
Burnishing is the final process of the metal machining as it makes the end product shiny. This is achieved by using the drill press, lathe or a milling tool.
The process of machining involves a combination of the above mentioned processes. The process involves a relative motion between the tool and work. This relative motion includes the “cutting speed” and “feed”. The shape of the tool and its penetration into the work surface and the various motions result in the perfection of the desired shape of the required metal. The finished product would meet the specifications as mentioned by the engineering drawings or blueprints.