--- title: "Product cycle and manufacturing flows" subject: "Manufacturing and Production Processes" chapter: 1 key: "semester_4/manufacturing_and_production_processes:product-cycle-material-information-flow" source: https://www.bctengineer.com/q/semester_4/manufacturing_and_production_processes/product-cycle-material-information-flow site: BCT Engineering --- # Product cycle and manufacturing flows Manufacturing and Production Processes · Chapter 1: Overview of Manufacturing - Asked in: year not given, 6 marks - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_4/manufacturing_and_production_processes/product-cycle-material-information-flow - Whole chapter: https://www.bctengineer.com/md/semester_4/manufacturing_and_production_processes/chapter-1 ## Question Explain the product cycle from market need to disposal. Distinguish between the material flow and the information flow in a manufacturing system, giving the main activities in each. ## Short answer Product cycle stages are market need, design, process planning, production, distribution/use/service, and disposal/recycling. Material flow is physical movement through purchasing, storage, processing, assembly, inspection, packing and dispatch. Information flow carries orders, drawings, bills of material, schedules and reports both ways, and must be synchronised with material flow. ## Answer The **product cycle** is the sequence of stages a product passes through from the identification of a customer need to its final disposal or recycling. Manufacturing is only one stage of it, but decisions taken in the design stage fix most of the cost of the product. #### Stages of the product cycle ```text Market need -> Concept design -> Detail design ^ | | v Disposal/ <- Use & service <- Manufacture <- Process recycling & assembly planning ``` 1. **Market need and specification** - customer requirement, competitors, target cost and volume. 2. **Design** - concept, analysis, material selection, drawings, prototype and testing (design for manufacture and assembly). 3. **Process planning** - choice of processes, machines, tooling, sequence of operations, inspection plan. 4. **Production** - fabrication of parts, assembly, quality control, packing. 5. **Distribution, use and service** - sales, maintenance, spare parts, warranty. 6. **Disposal or recycling** - reuse of materials, safe disposal. #### Material flow and information flow The material flow is the physical movement and transformation of raw material into the finished product. The information flow is the stream of data that plans, controls and records that movement. | Basis | Material flow | Information flow | |---|---|---| | Nature | Physical items | Data and documents | | Direction | Supplier to customer | Both ways: orders down, feedback up | | Activities | Purchase, storage, processing, handling, assembly, inspection, packing, dispatch | Customer order, drawings, bill of materials, process plan, schedule, work order, inspection reports | | Tools | Conveyors, AGVs, fixtures, stores | MRP, ERP, CAD/CAM, barcode, CNC programs | | Aim | Minimum handling and waiting | Right item, right time, right quantity | The two flows must be synchronised: a work order (information) releases material from the store, and the completion record (information) updates the stock. Poor information flow produces idle machines, excess work-in-process and late deliveries even when the machines are good. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. What does the product cycle cover? A. Only the manufacturing and assembly stage B. Customer need through design, production, use and finally disposal or recycling C. Only design and process planning D. Only sales, service and warranty Answer: B. The product cycle runs from identifying a customer need to final disposal or recycling; manufacturing is only one stage. (Key point: Scope of product cycle) 2. Why is the design stage especially important in the product cycle? A. Decisions taken in design fix most of the product cost B. It is the longest stage in time C. It is the only stage that involves the customer D. It decides the disposal method only Answer: A. Although manufacturing is only one stage, design decisions fix most of the cost of the product. (Key point: Role of design stage) 3. Which statement correctly distinguishes material flow from information flow? A. Material flow is data and documents; information flow is physical items B. Both flow only from supplier to customer C. Material flow moves physical items from supplier to customer; information flow carries orders down and feedback up D. Information flow includes conveyors and AGVs Answer: C. Material flow is physical movement and transformation; information flow is two-way data that plans, controls and records it. (Key point: Material vs information flow) 4. What happens when information flow is poor even though machines are good? A. Handling distance is reduced B. Idle machines, excess work-in-process and late deliveries C. Material flow becomes two-way D. Bills of materials become unnecessary Answer: B. A work order releases material and a completion record updates stock; poor information causes idle machines, excess WIP and late delivery. 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