This is an intellectual activity as a premise requires two powers by the person or persons who perform and are knowledge and wit. It is usual to find in companies that engage in this activity, people called engineers term derived from the construction of mechanical parts or devices, a word which in turn refers to the ingenuity and summary tacitly potential experiences and knowledge with a strong management mathematics and natural sciences Engineering is sometimes conceived as the art of applying scientific knowledge to the invention and it takes a very interesting mix of wisdom and inspiration. The design process begins by identifying clear and detailed requirements with the customer (including internal) on the element to be designed, as well as the constraints are such as economic, health, environmental, social, physical or technical, maintenance, etc., the next step is development of possible solutions or alternatives to these limitations, meaning that you can not always meet all the highest degree and always will, define the limits in the form of ranges or tolerances for them, it is important at this stage comment that, due to the current knowledge of mathematics and the use of computers so widespread, it is possible to simulate each of the options with low costs and waste are therefore very popular CAD systems (systems for computer-aided design), then makes the design of the production, ie what are the next step for both the manufacturing itself, and to support processes, resources, logistics, quality control, sales, post sales service, etc. It is almost always recommended the development of a prototype, which is studied in detail the behavior and in many cases their interaction with buyers, it is not uncommon to hear fairs where they are known as Concept Designs, who are seeking, as well as in all areas technique, also know the views of other specialists, as well as the general public, say in passing that, these activities respond to a management model focused primarily to the customer. The importance of prototypes reaches the end of talk of “pilot plant” to produce a given product, that in order to acquire full information on all the variables that interact in the design and product development. The activity of design of mechanical parts is currently a very important connotation essentially involves the ability to be easily replaced, because it generally is subjected to erosion or wear, requiring its change over a period of time, it becomes relevant to the extent that industrial production requires very high availability of equipment as it seeks to reduce fixed costs in this way, and an ROI in the shortest time possible..