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Precision machinery parts machining allowance can be blank margin, refers to the blank dimensions and the parts drawing design size difference. In general, the thickness of metal layer we can be understood as the workpiece machining process on the surface of the workpiece is cut. In daily life, we will use some methods to calculate the precision mechanical machining allowance? Three approaches are common.
1) look-up table method. According to the machining allowance for manual provides data, combined with the production practice revised after the determination of machining allowance. This is the factory wide, methods.
2) experience estimation method. Determination of machining allowance according to the technical personnel experience. In order to prevent margin is too small and the waste generated, the estimated allowance is too large. Commonly used in one-piece, small batch production.
3) analysis method. According to the theoretical formula and the experimental data, the factors affecting the Dongguan processing machinery parts machining are analyzed, calculation to determine the machining allowance. This method is reasonable, but need comprehensive and reliable test data, complicated calculation. Generally only used in the material is very expensive or a large, mass production factories.