casd reviewer

• Early Drawing Practices


  Prehistoric humans created images on cave walls and rocks and used it as a form of communication either for hunting or gathering. It provided ritual or spiritual meaning and for decoration.
• Prehistoric painting


  known as pictograms, and carvings known as petroglyphs show a variety of animals and human shapes, however, are not considered engineering drawings. But they do represent an early graphic form of communication. For thousands of years, designers of ancient structures and machines used sketches, drawings, and documents to represent inventions and architecture.
• Leon Battista Alberti 


  Most of the early creators of engineering drawings were artists and inventors, was an Italian who wrote about architecture and engineering. His writings covered wide range of subjects, from architecture to town planning and from engineering to philosophy of beauty. He also wrote two (2) works that explored the need to incorporate geometry in drawings. He also proposed drawings with multiple views rather than the commonly used pictorial diagrams.
• Leonardo da Vinci


  Besides from being well known for his art he was also an inventor. He designed machines such as the glider and military equipment with such greater accuracy and dimensions.
• René Descartes


  The importance of using Multiview two-dimension drawings was also influenced by the development of descriptive geometry in the work of French Philosopher. He invented the Cartesian coordinate system which uses the numerical coordinates to locate points in space according to distances measured in the same unit of length from three intersecting axes. The Cartesian coordinate system is the basis for establishing points when using CAD today.
• Gaspard Monge


  created a large-scale plan of a town using his own methods of observation and instruments he originally designed. He arrived at a graphic method of application of geometry of construction, which is now called descriptive geometry. Descriptive geometry is the system of graphic geometry that uses plane projections to describe and analyze their properties for engineering drafting applications.
• Graphic language


  in “engineering application” use lines to represent the surfaces, edges, and contours of objects. The language is known as “drawing” or “drafting.”
• Interchangeability


  refers to parts manufactured identically within given tolerances. Interchangeable parts were produced to specifications that made sure they were so nearly identical that they fit into any product for which they were designed.
• Engineering drawing


  a graphical means of expression of technical details without the barrier of a language. It is the universal language for engineers since no construction/manufacturing of any (man-made) engineering objects is possible without engineering drawing.
• Computer-aided design and drafting (CADD)


  the process of using information technology (IT) in the design and drafting applications. It enhances the ability of the designers and drafters in designing building structures, civil projects, and mechanical and manufacturing processes by providing many new tools such as solid modeling, animation and even virtual reality.