Numerical control is the abbreviation of digital control, English is Numerical Control, referred to as NC. At present, numerical control generally uses general purpose or special-purpose computers to implement digital program control. Therefore, numerical control is also called computer numerical control (CNC), which is abbreviated as CNC. Foreign countries are generally referred to as CNC and rarely use the concept of NC.
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4. Needle roller bearing / Double ball bearing
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The details are described below:
CNC (Numerical Control, NC
Digital control refers to the technique of controlling the motion of one or more mechanical devices using digital instructions composed of numbers, words, and symbols. What it controls is usually the mechanical quantity such as position, angle, speed and the amount of switching related to the flow of mechanical energy. The generation of numerical control relies on the appearance of data carriers and binary data operations. In 1908, a perforated metal foil interchangeable data carrier was introduced; at the end of the 19th century, a control system using paper as a data carrier and supporting functions was invented; in 1938, Shannon conducted rapid data calculation and transmission at the Massachusetts Institute of Technology. Laid the foundation of modern computers, including computer digital control systems. CNC technology is developed in close cooperation with machine tool control. In 1952, the first CNC machine was introduced and became an epoch-making event in the history of the world machinery industry, which promoted the development of automation.
Now, numerical control technology is also called computer numerical control (Computer Numerical Control). At present, it is a technology that uses computer to realize digital program control. This technique uses a computer to execute control functions for the device according to a previously stored control program. As a computer is used instead of a numerical control device originally composed of hardware logic circuits, the realization of various control functions such as storage, processing, calculation and logic judgment of input data can be completed by computer software.
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