BOM

BOM is the cornerstone of production systems and cost determination. The sheet is used in purchase planning of materials and diagrams of production and also when calculating cost of products. It is applied and to describe a product and to define a method of its production. On the basis of the sheet in the main production scheduled plan all components, i.e. raw materials, initial materials and component parts which need to be purchased or made are considered. The purchasing department uses the bill of materials and the production plan for determination what materials it is necessary to buy, and scheduling on purchases.

Classification of BOM

Example of BOM for the product "Table".

On extent of formalization

• Formalized
• Unformalized

On a data view format

• Single-level BOM. Contain data only on the components which are directly entering a parent nomenclature position.
• Multilevel (multilevel BOM). Contain data on all components entering a parent nomenclature position, up to the level of the purchased components and materials.
• With indents (structured) (indented BOM). Represent option of multilevel BOM with that difference that for simplification of visual acceptability of BOM apply indents to nomenclature positions components at the instruction them in the list of components of a parent nomenclature position. The quantity of positions of indents speaks about what level in a product structure has a matching component.

BOM types

• Normal BOM. Precisely the structure of the components and materials entering a finished product with determination of regulations of their expense on one unit of measure of finished goods and the production planning focused on standard types of products is specified.
• Planned BOM (planning BOM, modular BOM). Its main difference from normal BOM consists in use of so-called phantom nomenclature positions, i.e. those which are entered only for the purpose of production planning and purchases and physically do not exist. This logical one is implemented into structure declaration of a product (specification) to describe variability of products at the component level and materials and also to simplify forecasting of need for finished goods.

Vida BOM

Example of MBOM.

Example of EBOM.

EBOM (Engineering Bill of Material) is the sheet of structural materials. Reflects structure of a product at a product design stage the engineer.

MBOM (Manufacturing Bill of Materials) is the production bill of materials. Defines a method by which the product will be made. MBOM turns out on the basis of EBOM. The main differences of MBOM from EBOM:

• the product elements (break into subelements) which are present at EBOM, but not existing in reality are excluded. For example, group of two parts which are logically grouped by the designer, but as the uniform part, is not made (Assembly B);
• elements which are necessary for production of a product are added, but at design have no value. For example, paint or varnish. (Item F).

CBOM (Configurable Bill of Materials) is the configured bill of materials. The kind of BOM used in those industries where the configuration of an end product is changeable (for example, telecommunication systems, automotive industry). It is used for dynamic creation of an end product which is sold by the company.

See Also

CAD