Bill of Materials - 13: Dash Numbers and Vehicles
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
Many assemblies require a more complicated Bill of Materials. These are usually products that have minor variations of the same parts. In these cases, the B/M for these products will generally employ dash numbers to identify the different product variations. Two examples of these types of products are vehicles and industrial equipment.

Vehicle products such as aircraft, ships, and automobiles are symmetrical, and have identical left and right hand parts. For example, the left and right wings of an airplane are identical, but they are mirror images of each other. Thus, they must be assembled from identical, but left handed and right handed parts. To indicate left or right hand, the B/M will have 1 and 2 blocks, and the detail parts in each assembly will have 1 and 2 versions. Examples of left and right hand assemblies are shown below.

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label: BOM. bill of material, item numbers, key numbers, material specifications, assembly blueprint, subassembly, dash numbers and vehicles