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First-angle is drawing the object sides based on where they land. Example, looking at the front side, rotate the object 90 degrees to the right. What is seen will be drawn to the right of the front side. Third-angle is drawing the object sides based on where they are. Example, looking at the front side, rotate the object 90 degrees to the right.
The list of materials (L/M, LM, LoM), bill of materials (B/M, BM, BoM), or parts list (P/L, PL) is a (usually tabular) list of the materials used to make a part, and the parts used to make an assembly. It may contain instructions for heat treatment, finishing, and other processes, for each part number.
Rulers used in technical drawing are usually made of polystyrene. It is used for drawing lines and connecting points. Rulers come in two types according to the design of their edge. A ruler with a straight edge can be used with lead pencils and felt pens, whereas when a technical pen is used the edge must be grooved to prevent the spread of the ...
The terms computer-aided drafting (CAD) and computer-aided design and drafting (CADD) are also used. [2] Its use in designing electronic systems is known as electronic design automation (EDA). In mechanical design it is known as mechanical design automation (MDA), which includes the process of creating a technical drawing with the use of ...
While the Rapidograph style of pen is still widely used by artists, the use of computer-aided design has largely replaced the need for manual drafting. Also, the development of felt-tip, ink-based pens has provided cheaper, lower-maintenance disposable tools that sell much better than traditional technical pens.
Material is generally annealed between each drawing pass to increase its ductility and remove internal stresses produced during the cold working. Annealing : This is a thermal treatment generally used to soften the material being drawn; to modify the microstructure, the mechanical properties, and the machining characteristics of the steel; and ...