![]() ![]() For example welding symbols where you need only select left hand or right hand, size of weld, far side or near side and so on. In these systems, you click on the requirements you want and the software builds the symbols for you. Most cad systems nowadays use symbol libraries that use software driven symbol generators that dont require a huge library of symbols at all. Menu driven systems could also be used with large digitizing tablets, where all the symbols were in plain sight and all you had to do was point to them to build up a schematic diagram. ![]() You didnt need to have a drawing full of symbols loaded into memory. Things got more sophisticated when these libraries were organized into menus, where you could pick the symbol you needed from a drop down list. ![]() The simplest of these libraries were just individual drawings which you opened, copied what you needed, then pasted the symbols into the drawing you were working on. When 2D drafting systems first started being used, it made sense to build up libraries of frequently used symbols so they could be be cut and paste onto drawings as required. ![]()
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