The components in the skeletal model do not take into account the specific structural details, such as the form of the gear hub, the keyway on the gear shaft, the chamfer and the ribs of the box, the oil groove, etc. These dimensions need to be determined in the subsequent design process, and their changes are generally Only local effects are produced and are defined herein as secondary dimensions. When constructing the skeleton model, more attention is paid to capturing and extracting the correlation and dependence between each subassembly and parts in the initial product overall layout, and determining the primary dimension. At this point, the primary dimension is clear and the secondary dimensions are blurred. Only in the later stage of the design, the replacement function is used. On the basis of ensuring the primary size, the secondary size is determined, and then the simple graphic in the original sketch is replaced by a complex component with a practical functional shape formed by the final design. Thereby achieving the whole process of top-down design.
Copying and Transfer of Design Data In the “Top Base Skeleton†of the formed reducer, the main design data of the reducer components has been included, which is the basis or basis for the design and assembly of the reducer parts. In the manual design, these data are numerous and difficult to be effectively saved and used. The CAD environment provides this possibility. An important part of the subsequent work is to pass the data from the top-level basic skeleton model to the part through the "copy" mechanism.
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