Precision casting casting has its fixed characteristic, because of the casting itself is the quality, so we are in clear the properties of the casting after machining is that we can be more skilled operation, so as to have a better quality of castings.The inherent quality of precision casting casting features:1, precision casting, casting quality appearance.The dimensional tolerance and geometric tolerance, surface roughness, geometric error amount;Weight deviation, machining allowance and other quality error;Type and severity of surface and near surface defects;Casting lumen surface quality and cleanliness.2, precision casting, casting internal quality.Casting chemical composition, microstructure and mechanical properties such as material quality.Internal defect type and severity.