The way in which drawing can express itself in a language mode is to make known graphic images of things that man has observed throughout his history of his environment, through which ideas and / or expression of communication can be represented.
For us Mechanical Engineers is very important to know how to express the technical drawing, since by means of geometry as a material means that uses the drawing uses the straight line for the longitudinal lines, where the measures of separation and 3d images are fundamental in the construction of the designs of applied torques, resistance of the materials and the dynamic and static condition in the operation of turbo machines, evaporators and condensers on a large scale.
[This is the case of a form of free drawing that expresses the feelings of the artist, and that for nothing in the world is the reality of a need that is not surreal expressed]
Differences between artistic drawing and technical drawing.
When the man in his beginnings felt the need to express his deepest feelings, he resorted to drawing as a means of artistic communication, always expressed with a personal approach and with an aesthetic condition.
When the drawing expressed by an artist does not present the characteristics of the drawing based on reality, it is because at the moment of painting he wanted to express the drawing as he saw them at the time, especially focused on the fact of what the current feelings of the artist were like at the moment of expressing them. We can conclude then under this perspective that the free drawing expressed by the artists is a form of subjective communication, since by no means the artist tries to give us a clear and accurate information of the external reality.
Everything is very different in the way of communicating by means of technical drawing, one of the essential characteristics of technical drawing must be that of being able to express exactly the external reality by means of technical drawing. For example, when we draw a map, it must express the reality of the location of its geographical means, but for nothing in the world should express the feeling or the thought of its author, because if the person who makes the drawing lets express their feelings in the drawing, can reach to distort the real essence of the objective that the technical drawing intends to transmit.
The knowledge that teaches us to communicate through technical drawing teaches us not to have the freedom to make technical drawings to our liking, but rather to draw them based on technical characteristics, and these in turn are far from being able to express our feelings through technical drawing.
Importance of technical drawing as a communicating medium within mechanical engineering.
The technical drawing must possess essential characteristics under which it can always express an engineering reality, with the purpose of making known who are the interested ones of the exact form of measures and characteristics of the drawn object, in the case of mechanical engineering it can deal with machines industrial small or large scale.
In essence the importance of technical drawing in mechanical engineering is that if we use it as a means of communicational expression, since there are no bodies of machines that do not start from the idea of a previous design or a plane, that the final practitioner he must know how to read so that he can materialize the idea presented in it.
A clear and simple example of a technical drawing is that expressed within mechanical engineering as a mechanical drawing, it gives details of the measurements for example of cuts or sections of artifacts or parts of machinery, exposing their elements components and its fundamental principle.
Conclusion
From the communication needs of the human being arose a branch different from the word, and is nothing more than the ability he had to draw, once this art was developed in great artists such as: Picasso, Van Gogh, Da Vinci among others, had to develop another form of drawing, one that did not express the surreal, but rather the reality of a need for engineering and technology, this was the technical drawing, emerged to be able to respond to communication needs where what it will reflect exactly what reality represents, such as exact measurements of the design and construction of machinery.
This is how today we can see software that simplifies us those tasks such as AutoCAD, so that we continue at the forefront of accuracy and precision, but without the possible errors that manipulation of the technical drawing operated by human hands may have.