What are the key factors in designing mechanical parts?
1- reliability. For example, the design of a transmission shaft, to consider whether the uniform load or impact load, axial load or radial load or both, or combined force. In general, even small loads can be fitted with clearance or transition fit, and tolerances can be enlarged so that processing costs are low. For high speed or large load or impact loads, interference fit should be used, such as flywheel shaft of diesel engine.
3- processing, you design things to consider whether can be processed, processing convenience or not.4- cost issues. Price performance is good.
2- rationality. Also to the shaft, for example, the outer diameter tolerance depends on what things, such as with bearings, it must be in accordance with the requirements of the base hole design, that is, in accordance with the diameter tolerance of bearings to determine the diameter tolerance.
