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ME 317 Design for Manufacturing. What Constitutes a “Good” Design?. SMIU Rules for Good Design . Good Design Should –. SMIU Rules for Excellent Design. Excellent Design Should -. Why Design for Manufacturing?.

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smiu rules for good design
SMIU Rules for Good Design

Good Design Should –

smiu rules for excellent design
SMIU Rules for Excellent Design

Excellent Design Should -

why design for manufacturing
Why Design for Manufacturing?
  • Mechanical engineering designs generally include off-the-shelf components and fabricated parts.
  • Knowing the strengths and limitations of the fabrication techniques makes for higher quality and more cost competitive designs.
ten general design principles chapter 1 3
Ten General Design Principles(Chapter 1.3)
  • Simplicity
  • Standard Materials and Components
  • Standardized Design of the Product
  • Liberal Tolerances
  • Use Materials that are Easy to Process

Ten General Design Principles(Chapter 1.3)

  • Teamwork with Manufacturing Personnel
  • Avoidance of Secondary Operations
  • Design to Expected Level of Production
  • Utilize Special Process Characteristics
  • Avoid Process Restrictiveness
  • Description: minimize the number of parts, intricate shapes, and manufacturing operations
  • Motivation: generally provides reduced cost, improved reliability, easier servicing, and improved robustness
  • Example: Braun Lift
standard materials and components
Standard Materials and Components
  • Description: Use standard off-the-shelf parts and widely available materials
  • Motivation: eases purchasing, simplifies inventory management, and avoids tooling investments
  • Example: Screws
standardized design of the product
Standardized Design of the Product
  • Description: For similar products, specify the same materials, parts, and subassemblies as much as possible.
  • Motivation: provides economies of scale, simplifies operations, and simplifies inventory management
  • Example: Braun Lift
liberal tolerances
Liberal Tolerances
  • Description: make tolerances as forgiving as possible
  • Motivation: tight tolerances are expensive (in a non-linear fashion)
  • Example: Figure 1.3.1
use easily processed materials
Use Easily Processed Materials
  • Description: take advantage of materials that have been developed for easy processibility
  • Motivation: while material may cost more, it will often provide lower overall cost
  • Example: “Free-Machining” Grades, Many polymer grades are tuned to a process
teamwork with manufacturing personnel
Teamwork with Manufacturing Personnel
  • Description: collaborate with the people who will be producing your product (the earlier the better)
  • Motivation: they provide a unique body of knowledge and useful insights
  • Example:
avoidance of secondary operations
Avoidance of Secondary Operations
  • Description: minimize the need for secondary operations
  • Motivation: secondary operations (e.g. deburring, inspection, painting, and heat treating) can be as expensive as the primary manufacturing operation
  • Example: Pre-painted steel, investment casting, MIM in firearms
understand and utilize manufacturing process characteristics
Understand and Utilize Manufacturing Process Characteristics
  • Description: understand and take advantage of the special capabilities of various manufacturing processes
  • Motivation: can often eliminate manufacturing operations and reduce the number of parts
  • Example: injection molding snap fits and living hinges
avoid process restrictiveness
Avoid Process Restrictiveness
  • Description: on part drawings, specify only the final characteristics needed; do not specify the process to be used
  • Motivation: potential cost savings