CNC also known as computer routing, CNCCH or NC machine tool is actually HongKong there’s a term, then was introduced into China, the pearl river delta is CNC milling machine, and in other area to be called “CNC machining center” a kind of mechanical processing, is a new processing technology, main job is processing program, the original manual work to computer programming.  Of course, manual processing experience is required.

In CNC lathe processing, the determination of the processing route should generally follow the principles shown as below:

1.The accuracy and surface roughness of the workpiece should be guaranteed.  

2. Make the shortest processing route, reduce the empty travel time, improve the processing efficiency.  

3. Try to simplify the workload of numerical calculation and machining procedures.  

4. Subroutines should be used for some repetitive programs 

 CNC processing has the following advantages:  

1.Greatly reduce the number of tooling, processing of complex shape parts don’t need complex tooling.  If you want to change the shape and size of parts, only need to modify parts processing procedures, suitable for new product development and modification.  

2. Stable processing quality, high processing accuracy, high repetition accuracy, to meet the requirements of aircraft processing.  

3. The production efficiency is higher under the condition of multiple varieties and small batch production, which can reduce the time of production preparation, machine tool adjustment and process inspection, and reduce the cutting time due to the use of the best cutting quantity.  

4. It can process the complex surface which is difficult to be processed by conventional methods, and can even process some parts which cannot be observed.  

The disadvantage of CNC machining is that the cost of machine tools and equipment is expensive, and maintenance personnel are required to have a higher level.