Bill of Materials - 12: Example
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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.
The example general assembly contains two subassemblies, an air press assembly and a jig assembly. Each of these subassemblies is an assembly of other components.

Item 2, Air Press Assembly, seen in the image below consists of:
- Bracket, a machined part
- Stop Block, a machined part
- Air Press, a purchased part
- Nuts and bolts, purchased parts

Although it might be possible to assemble all of these components during the final general assembly, it is much more convenient for handling to assemble these components into a subassembly first.
The B/M contains a simple description of each of the three items. Therefore, all the information needed to make this assembly is shown on a single page.

Detail Assembly drawings can be more complex, however, consisting of several pages with numerous details on each page. In such cases, the bubble information on the assembly drawing may show the page number upon which the detail may be found. The split bubble may also be used to indicate the quantity of the item required. In all cases of split bubbles, the top number refers to the item number

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