23-CS-4 Engineering Management · May 2017
Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
National Exams — May 2017 — 11-CS-4 Engineering Management. Closed book; no calculators. Any five questions constitute a complete paper; all questions are of equal value (20 marks each). Full worked answers to all seven questions are given below.
Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.
Proactive design for manufacturing (DFM) means considering manufacturing requirements from the very beginning of the design process rather than reacting to production problems after the design is frozen. It is proactive because manufacturing, quality, and supply-chain knowledge is brought forward into design through concurrent engineering, so that products are deliberately designed to be easy, reliable, and economical to make—minimizing part count, standardizing components, relaxing non-critical tolerances, and matching features to the chosen process. Since roughly seventy to eighty percent of a product's cost is committed at the design stage, proactive DFM prevents expensive late changes and quality problems that reactive design invites. The manufacturing functions that must be integrated include product and process design and engineering; production planning and control (scheduling, materials, capacity); procurement and supply-chain management; the actual production/fabrication and assembly operations; quality assurance and control; maintenance of equipment and facilities; tooling and industrial engineering; and inventory, logistics, and shipping. Proactive DFM aligns the design with the realities of all these functions simultaneously.
Lean manufacturing pursues the elimination of all waste (muda)—anything that consumes resources without adding customer value—and achieving that goal requires studying every area of the organization. The production processes themselves must be mapped (through value-stream mapping) to expose overproduction, waiting, over-processing, and defects. Inventory and materials management must be examined to remove excess raw, work-in-process, and finished stock, moving toward just-in-time pull. Plant layout and material flow must be studied to eliminate unnecessary transportation and motion, favouring cellular, one-piece flow. Setup and changeover practices must be analyzed and shortened (SMED) to allow small, flexible batches. Quality systems must be studied to drive defects and rework toward zero at the source through mistake-proofing. Equipment reliability and maintenance must be addressed (total productive maintenance) to eliminate breakdown waste. Workforce practices, training, and organization must be examined so that skills, standardized work, and 5S housekeeping support the system. Finally, supplier relationships must be studied, since reliable, high-quality, on-time supply is essential to a low-inventory lean operation. Waste anywhere in this chain undermines the zero-waste goal.
Kaizen—Japanese for "change for the better"—is the philosophy of continuous, incremental improvement driven by everyone in the organization, and its implementation follows a disciplined approach. It is grounded in the Plan-Do-Check-Act (PDCA) cycle: plan an improvement, implement it on a small scale, check the results against expectation, and act to standardize the gain or to revise and try again, then repeat continuously. The approach emphasizes employee involvement at all levels, since the people who do the work best see the waste; it relies on gemba—going to the actual workplace to observe facts rather than theorizing from the office; and it favours small, low-cost, incremental changes that accumulate into large gains rather than infrequent large investments. Improvements are standardized once proven, so each gain becomes the new baseline and cannot slip back, and the cycle then targets the next opportunity. Management must create a supportive culture—training, teamwork (quality circles or kaizen events), recognition, and the psychological safety to expose problems—so that continuous improvement becomes a permanent habit rather than a one-time program.
A manufacturer of hydraulic manifolds would apply proactive DFM by having production and quality engineers review the manifold design early, consolidating ports and standardizing seals to cut machining and assembly. A value-stream study would expose waiting between machining and test, prompting a cellular layout and kanban pull to attack inventory and transport waste. Weekly kaizen events, run through PDCA at the gemba with operator participation, would then incrementally cut changeover time and scrap, each improvement standardized before the team moves to the next.
