Blocks also offer a great way to represent design components that we want reflected later in a bill of materials. Changes to the block will be reflected everywhere it is used in the drawing. And if we have a 3D block of the fastener, we can also re-use that block again in all of different views of our drawing. Rather than actually drawing the same fastener detail from scratch every time it is needed in a view, our fastener block can be inserted as a reference entity everywhere we want the fastener to appear, saving both data space and drawing time. For example, say we use the same fastener several times in a drawing. Blocks are drawings which can be re-used multiple times in another larger drawing. To begin with, both progeCAD and AutoCAD support the use of external and internal blocks in a drawing file. ![]() These programs are potentially suitable for any of those specific domains when given little extra thought from the user. AutoCAD or progeCAD, on the other hand, are seen as more general-use design standards. ![]() Most BOMs are expected to report intelligence about materials, suppliers, part numbers and other attributes of a design's components in a way that is already specific to a certain domain, such as building or machine design or electronics, etc. Wikipedia defined a Bill Of Materials, BOM or product structure as "a list of the raw materials, sub-assemblies, intermediate assemblies, sub-components, parts and the quantities of each needed to manufacture an end product".
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