1） It can be expressed in two ways: diameter value programming or radius value programming and radius value programming.
The default programming method of CNC system is diameter value programming. This is because the radial dimension of the processed part is expressed by diameter value when measured on the drawing. Therefore, it is most convenient to use diameter value programming, that is, when programming with absolute value in diameter direction, X is shown as diameter value; When programming with increment value, it is represented by double value of radial actual displacement, and direction symbol is attached (positive direction can be omitted).
（2） Absolute value programming, incremental value programming or mixed programming are adopted. According to the drawing dimensions of machined parts, from the point of view of easy programming, absolute value programming, incremental value programming or mixed programming are adopted in a program segment. When programming in absolute coordinates, they are represented by coordinate words X and Z; when programming by incremental coordinates, they are represented by coordinate words u and W.
（3） Most CNC lathes have the function of tool automatic compensation. By using this function, the tool tip radius compensation, tool wear compensation and position error compensation when installing the tool can be realized. Before CNC precision machining, as long as the operator inputs the relevant compensation value into the specified memory, the CNC system can automatically carry out tool compensation. No matter the change of tool tip radius, tool wear or tool position, there is no need to change the machining program, so the programmer can program according to the actual contour size of the workpiece.
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