The biggest advantage of investment casting due to the high dimensional accuracy and surface finish of the molten castings, thus it can reduce the machining work. It is interesting that only in the parts require higher parts to leave a small amount of machining margin. Even some castings only left to play dew and polish the remaining stars without mechanical processing can be used. As can be seen, the use of precision casting methods can save a lot of machine tools and equipment and processing hours for substantial savings in metal raw materials.