- Dimension labeling shall conform to the characteristics of nc machining.
In numerical control programming, all points, lines, dimensions and positions are based on the origin of programming. Therefore, it is better to give the coordinate dimension directly or to the same reference size.
- The conditions of geometric elements should be complete and accurate.
In programming, the programmer must fully grasp the geometrical factor parameters and the relationship between the geometrical elements. Because at the time of automatic programming to outline all of the metal parts geometry elements are defined, the manual programming to calculate the coordinates of each node, no matter what is not clear or uncertain, programming can be performed. However, due to the lack of consideration or omission in the design process of the part designer, the parameters are often incomplete or not clear, such as arc and line, arc and arc are tangent or intersecting or disconnecting. Therefore, when reviewing and analyzing the drawings, be sure to be careful and contact the designer in time.
- Reliable positioning datum.
In nc machining, the machining process is often concentrated, and it is very important to use the same benchmark. Therefore, it is often necessary to set some auxiliary benchmarks, or add some process punch to the blank.
- Uniform geometric type or size.
The shape and inner chamber of the parts should be in a uniform geometrical type or size, which can reduce the number of times of changing the knife, and the control program or special program may be used to shorten the program length. The shape of the parts is as symmetrical as possible, and it is convenient to use the mirror of nc machine tool to program the machining function to save programming time.
