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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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Me 317 design for manufacturing l.jpg

ME 317Design for Manufacturing


What constitutes a good design l.jpg

What Constitutes a “Good” Design?


Smiu rules for good design l.jpg
SMIU Rules for Good Design

Good Design Should –


Smiu rules for excellent design l.jpg
SMIU Rules for Excellent Design

Excellent Design Should -


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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.


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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


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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


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Simplicity

  • 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



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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


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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


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Liberal Tolerances

  • Description: make tolerances as forgiving as possible

  • Motivation: tight tolerances are expensive (in a non-linear fashion)

  • Example: Figure 1.3.1


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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


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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:


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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



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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


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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


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