Confirm the precision mechanical workpiece machining allowance method

Precision mechanical workpiece machining allowance can be blank allowance, refers to the difference of the blank size and part drawing design size. In general, we can understand the workpiece machining process on the workpiece surface cut by the thickness of metal layer. In daily life, we will with what method to calculate precision mechanical workpiece machining allowance? There are three common methods. 1) Look-up table method. According to the relevant manual machining allowance provided by the data, and then modify it in combination with the practical situation of our factory produced after determine the machining allowance. This is the factory widely, using the method. 2) Experience estimation method. According to process itself of experience to determine the machining allowance. Generally in order to prevent allowance is too small and scrap, estimated allowance always larger. They can be used for single piece and small batch production. 3) Analysis and calculation method. According to the theoretical formula and experimental data, various influence factors of dongguan machinery parts machining allowance for analysis and calculation to determine the machining allowance. This method is reasonable, but need comprehensive and reliable experimental data, calculation is more complex. In material is very valuable or only commonly used in a few large, mass production of the factory.