Obviously, precision machining has evolved over time, and advancements in all related technologies help push the limits that define precision machining and improve performance consistently. The real art in precision machining comes with the marriage of computer controlled design and human engineered design for the creation of unique features and highly controlled output and functionality driven by advancements in fluid dynamics, chemical control, mechanical, climate extremes and durability required in modern hardware technologies.  Precision machining is particularly important to create tools and parts in a way that is precise, stable, and can be repeated with consistency, accuracy, and durability.Precision machining is a subtractive process where custom software, engineered tools, and process steps are utilized with raw material such as plastic, ceramic, metal or composites to create desired fine-featured products. Precision machining often follows the instructions given by computer aided design (CAD) and computer aided manufacturing (CAM) programs. These programs and the blueprints enhance the ability to meet tight tolerances. While most designs end up as engineered and computer aided designs, many start out as hand drawn sketches in the initial phases.