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It also explains BOP and process planning concepts, factors to consider, engineering drawing essentials, controlling variability, parts planning, and how tolerances and material choices affect both cost and production 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considers dimensions/size, surface finish, geometric shape, tolerance, material being processed, product value and urgency, and available manufacturing capabilities and resources.","https://schema.org",{"og:url":32,"og:type":73,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":75,"canonical":32},"index,follow",{"doc_id":77,"site_id":7},674857,1793769564,{"code":4,"msg":80,"data":81},"success",[82,86,90,94,99,103,108,113,118,121,125],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":83,"show_sort_weight":84,"slug":85},"Story & 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Bill of  \nMaterials (BOM)  \nThese three operating documents work together to provide clarity to:  \n• What and how many components form the product?  \n• What are the steps/sequence for fabricating the product?  \n• How can the product continue to be produced effectively as its complexity increases?  \n\n| | Summary\u003Cbr>Engineering and assembly drawing provides:\u003Cbr>• Visual representation of product & components\u003Cbr>• Fit, tolerances, and assembly specifications\u003Cbr>Bill of process (BOP) addresses:\u003Cbr>• Processes that produce the product, and their sequence\u003Cbr>• Specifications and parameters of each process step\u003Cbr>Bill of materials (BOM) addresses: :\u003Cbr>• Components forming the product\u003Cbr>• Production time per component |\n| --- | --- |\n\nBasic Elements of Bill of Materials (BOM):  \n􀂆 Lists quantities of components, ingredients/materials required to make a product  \n􀂆 Integrates product hierarchy through parent/child delineation Levels of a product:  \n􀂆 Parent: End item (or final product)  \n􀂆 Children: Raw materials, components, and sub-assemblies Demand may depend on product levels:  \n􀂆 Parent: Independent demand (external to the system)  \n􀂆 Children: Dependent demand (internal to the system)—Demand for an item depends on the demand for items ”higher up” on the BOM  \nBill of Materials-Example-product hierarchy  \nThe BOM provides information about:  \n• Relationship between items at different levels  \n• Quantity of each item  \n• Lead Time of each item  \nBOM Generaton Components:  \nLow-Level coding (LLC):  \n􀂆 A number that identifies the lowest level at which a specific item exists in the BOM  \n􀂆 Allows for easily computing the requirements of an item existing at different levels of the BOM  \nBOM Processor:  \n􀂆 Essential component in most commercial packages; maintains the BOM and automatically assigns LLCs  \n􀂆 Is essential for products with large BOMs (e.g., automobiles with approximately 30,000 components)  \n􀂆 Item G can be coded as Level 2 (under B) or Level 3 (under E)  \n􀂆 LLC convention has it coded as Level 3  \nBill of Process  \nProcess planning is typically documented on a routing sheet, also known as a bill of process (BOP) Process Documentation  \n􀂆 Workflow process mapping (value stream mapping)  \n􀂆 ISO process documentation  \nProcess planning organizes these production-related elements:  \n􀂆 Methods of production  \n􀂆 Tooling  \n􀂆 Fixtures  \n􀂆 Machinery  \n􀂆 Sequence of operations  \n􀂆 Processing time of operations  \n􀂆 Assembly methods  \nFactors to be considered during process planning:  \n􀂆 Dimensions/size  \n􀂆 Surface finish  \n􀂆 Geometric shape  \n􀂆 Tolerance  \n􀂆 Material being processed  \n􀂆 Product value and urgency  \n􀂆 Manufacturing capabilities and resources available  \nEngineering Drawings  \nInformation on an engineering drawing or “blueprint”:  \n􀂆 Title  \n􀂆 Version  \n􀂆 Material  \n􀂆 Projection type  \n􀂆 Units  \n􀂆 Scale  \n􀂆 Other (i.e., assembly instructions, intellectual property, tolerances)  \nControlling variability in BOM and BOP:  \n􀂆 Adds to cost, complexity  \n􀂆 Impacts quality control, inventory readiness, parts tracking, supplier contracts  \nParts Planning:  \n􀂆 Consider a parts tracking system (for inventory ordering/control and quality traceability)  \n􀂆 Highly recommend a plan for each part!  \nDimensional tolerances:  \n􀂆 Defined as the allowable errors on a specific dimension  \n􀂆 Typically expressed as a range of values (i.e., the diameter of a hole is expressed as “3.5 inches ± 0.02,”which means that the hole is acceptable if its actual manufactured diameter is between 3.48 and 3.52 inches in diameter)  \nGeometric tolerances:  \n􀂆 Defined as the allowable errors on shapes, locations, and profiles (as opposed to size or dimensional tolerances)  \n􀂆 Specified on engineering drawings as a box with a leader connected to the feature of interest  \nMaterial Effect on BOM & BOP:  \nMaterial tradeoffs:  \n􀂆 Differe","cbCais6TtlFGTLie","https://ap.wps.com/l/cbCais6TtlFGTLie","pdf",1769511,13,"English","# Understanding Engineering & Assembly Drawings, BOP, and BOM\n## Operating Documents: What They Clarify\n## Bill of Materials (BOM) Fundamentals\n## BOM Generation Components\n## Bill of Process (BOP) and Process Documentation\n## Engineering Drawings Essentials\n## Controlling Variability in BOM and BOP\n## Parts Planning and Dimensional/Geometric Tolerances\n## Material Effects on BOM & BOP\n## Material Selection Drives and Properties","[{\"question\":\"How do engineering and assembly drawings, BOP, and BOM work together?\",\"answer\":\"They collectively define what components make up the product, how the product is fabricated (sequence and processes), and how production can continue as complexity grows.\"},{\"question\":\"What is low-level coding (LLC) in a BOM?\",\"answer\":\"LLC identifies the lowest BOM level where an item exists, enabling easy computation of item requirements across different BOM levels.\"},{\"question\":\"What factors should be considered during process planning for BOP?\",\"answer\":\"Process planning considers dimensions/size, surface finish, geometric shape, tolerance, material being processed, product value and urgency, and available manufacturing capabilities and resources.\"}]","18-Guide-BOM-BOP-Engineering-06032021-1 | PDF",33]