Due to the certain thickness of the coating layer, after the surface treatment of the parts, it is inevitable that the dimensions of the parts will change. The dimensions and tolerances of parts specified on the design drawings usually refer to the final dimensions and tolerances of the parts. If there are no fit requirements for the parts, electroplating or chemical plating on the final dimensions of the parts is still feasible. If the precision of the parts is relatively high and the fit clearance after assembly cannot accommodate the thickness and deviation of the coating layer sufficiently, then coating on the final dimensions of the parts is detrimental to the assembly and working performance of the products. To address the issue of dimensional fit for parts with mating requirements after plating, it is necessary to negotiate with the design and process departments of the parts to determine the pre-plating process dimensions of the parts, and reserve the thickness of the coating and the dimensional deviation of the plating in advance. It must be noted that the approach of only reserving the thickness of the coating without reserving the possible thickness deviation during coating is not feasible.
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