When machining parts on NC machine tools, the basic principle of locating and installing is to select the positioning datum and clamping scheme rationally. The following points should be noted when selecting:
1, strive to design, process and programming the basis of the unified calculation.
2, minimize the number of clamping, as far as possible after the location of clamping, processing all the surface to be processed.
3, to avoid the use of manual adjustment processing scheme, in order to give full play to the effectiveness of CNC machine tools.