Factors affecting preciseness of precision part Many factors can affect the precision of the part during the manufacturing process . Here are 3 factors that will have effects on it from the manufacturing process. Material Hardness of material is one of the main factors that will affect the precision. From raw material to a finished product, it will go through many process like milling, grinding and wire cutting. Within these process, the raw material is being shaped by spindle or grinder blade. If the metal is too hard or soft, the precision of the final product may be affected.In Future Precision, your trustworthy partner.