Analysis of the integrity and correctness of the parts drawing: the view of the parts should meet the requirements of national standards, the position is accurate and the expression is clear; the relationship between geometric elements (points, lines, faces) (such as tangency, intersection, parallel) should be accurate ; Dimensions should be complete and clear.
Analysis of dimensioning methods: The dimensioning methods of part drawings include local dispersive labeling method, centralized labeling method and coordinate labeling method. For the parts machined on the CNC machine, the dimensions on the part drawing should be as concentrated as possible or marked with the same reference (ie, the coordinate size) on the premise of ensuring the performance. This facilitates the NC programming. It also facilitates the unification of design basis, process benchmark and programming origin.