Machining includes hand machining and CNC (Computer numerical control) machining. Hand machining means people use hand to control lather or turning machine, milling machine, drilling machine, grinding machine, tapping tool and sawing machine etc. manually to make the machining works. It is suitable for simple and low volume production. CNC machining is machinists use a broad range of computer-aided machines to complete various machining works. The equipments mainly include CNC milling machine or CNC machining center, CNC turning machine or CNC lathes, CNC grinders and so on. Nowadays, most of machining workshop is equipped with CNC or computer numerical control machines and techniques. Through programming and certain software in g-code language, the CNC machine will convert the location of the workpiece in the X axis, Y axis and Z axis to programming language. Then the controller of CNC machines trough code language to guide axis of the machine to make the workpiece into certain shapes. Then get the precision machined parts. CNC machining fit for mass volume manufacturing and complicated structure machine components.
Compared with manual machining, CNC machinery has many advantages and create a lot of benefits first it can run faster and can save much time. It only take only several minutes or even seconds for CNC machines to produce sound parts which usually take skilled machinists or craftsmen several hours to make in manual machines. The parts or components made by CNC machinery can be achieved with close tolerance and beautiful surface finish at lower overall cost because it can run more efficiently and require less man power. Also CNC machine can reach high standard precision machining requirements. For the high tolerance requirements at +/- 0.005 MM or even higher.
CNC machining grows very rapidly during the last 3 decades in China. As fo now, there are total more than 40,000 companies who run various kinds of machining business, totaling with 3,000,000 machines and more than 9,000,000 people involved in machining activities. China has been the second largest manufacturing country, just smaller than the USA. Especially, the machining is very dynamic in Pearl River Delta region and the Yangtze River Delta region of China. Many very good and largest machining and manufacturing companies are located in Pear River Delta cities like Shenzhen, Dongguan and Guangzhou. They came out of the market of China very early and earned a very good reputation for the low pricing, good quality and high tolerance achieved.