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Populating Bills of Materials (BOMs) Bruce A. Harding Mechanical Engineering Technology

Populating Bills of Materials (BOMs) Bruce A. Harding Mechanical Engineering Technology. BOM is actually a parts lists (PL).

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Populating Bills of Materials (BOMs) Bruce A. Harding Mechanical Engineering Technology

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  1. Populating Bills of Materials (BOMs) Bruce A. HardingMechanical Engineering Technology

  2. BOM is actually a parts lists (PL) • Technically a BOM is a Parts List. However the term BOM has grown to be the common usage for the list portion of a drawing. A parts list, in turn, is one type of the broader terminology – associated lists • A parts list forms the cross-reference from the assembly to the definition information for the individual parts

  3. Placement of a parts list (PL) • A PL is integral to the drawing data set and may be included on a graphic presentation sheet. Or it may still be integral to the drawing data set but shown on a separate sheet from the graphic presentation • Line items in a PL may be listed from top-to-bottom (heading at the top) or from bottom-to-top (heading at the bottom) Integral parts list – on graphic sheet of drawing Integral parts list – on separate sheet of drawing

  4. Columns in a PL • Required columns in a PL include: Quantity, Part or Identifying Number (PIN), Nomenclature or Description. • Blocks for Next Assembly and Used On are required only if applications data is included, otherwise they are optional • Optional columns include CAGE code, Find Number (also known as Item Number), Weight, Document Number, Notes or Remarks, Units of Measure, etc.

  5. Items ancillary to a PL • When Find Numbers (Item Numbers) are used, balloons and leaders indicate the parts referenced by the Item Number • Unlike detail drawings, an assembly with Find Numbers requires only sufficient views to identify an instance of each unique part, since the quantity column indicates how many are represented by that one instance

  6. Information shown in a PL • Find Numbers (Item Numbers): optional, but when used indicate the total number of unique parts • Part Number: indicates the numerical portion of the unique part specification • Standard parts – the numerical portion of its specification (Items 3 and 5) • Stock material – its size specification (Item 2) • Custom part requiring a drawing – a drawing number cross references to its detail drawing (Item 1) • Commercial part – a vendor or catalog number is used as the identifying number (Item 4)

  7. Information shown in a PL • Quantity: indicates the quantity of a each unique part in the assembly • Description: the non-numeric portion of the part specification not otherwise shown in the Part Number column • Together these columns, plus any optional columns required, form the cross reference link between the assembly and its component parts, be they commercial, custom, standard or stock material Source: ASME Y14.34M-1996 Associated Lists

  8. Acknowledgments The author wishes to acknowledge the support from the Society for Manufacturing Engineers - Education Foundation, SME-EF Grant #5004 for “Curriculum Modules in Product Lifecycle Management.”

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