Bill of materials
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Bill of Materials

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Bill of materials

Bill of Materials

In a production control environment, a bill of materials (BOM) is a data model used to represent the relationship of a part to another part. Suppose we produce and sell bicycles. Suppose further that we have a certain bicycle named ExtremeCycle101, and that the parts that go into producing this type of bike can be partly illustrated as shown below.


Bill of materials

ExtremeCycle101

. .

HandleBarX

FrameX

SeatB919

Wheel111

Frame101

PedalZ1

Rim120

Spoke12


Bill of materials

The diagram above informs us that an ExtremeCycle101 I

an assembly (it has component parts) that is constructed

from those types of parts shown at the second level

(HandleBarX, FrameX, SeatB919, Wheel111, …).

HandleBarX is a part, it is not an assembly. Note that

FrameX is another assembly made from a specific frame

and pedals. The type of diagram shown above is called a

parts explosion; it can show in great detail the various part

that are required to build the part shown at the top, at the

root. In some enterprise, a parts explosion could detail

hundreds or thousands of parts. Another common way to

illustrate this information is in a table such as:


Bill of materials

Part

Component

Quantity

ExtremeCycle101

HandleBarX

1

ExtremeCycle101

FrameX

1

ExtremeCycle101

SeatB919

1

ExtremeCycle101

Wheel111

2

FrameX

Frame101

1

FrameX

PedalZ1

2

Wheel111

Rim120

1

Wheel111

Spoke12

21


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