In many CAD systems, cabling is determined by the network system. The mesh is too dense, although the path is increased, but the stepping is too small, the data volume of the field is too large, which inevitably has higher requirements on the storage space of the device, and the computing speed of the object computer electronic product is also Great impact. Some of the paths are invalid, such as occupied by the pads of the component legs or occupied by the mounting holes and the holes. The grid is too sparse, and too few paths have a great impact on the routing rate. Therefore, there must be a sparse and reasonable grid system to support the wiring.
The distance between the legs of the standard components is 0.1 inches (2.54mm), so the basis of the grid system is generally set to 0.1 inches (2.54 mm) or less than 0.1 inches of multiples, such as: 0.05 inches, 0.025 inches, 0.02 Inches and so on.