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Analyzing the Product

Analyzing the Product. Stapler example:. Analyzing the Stapler. What would cause the stapler not to work? What is the “architecture” of the stapler? (how parts are laid out, functions, arrangement in space) Liaison Diagram (p.4). Liaison Diagram. rivet connects anvil to base

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Analyzing the Product

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  1. Analyzing the Product • Stapler example:

  2. Analyzing the Stapler • What would cause the stapler not to work? • What is the “architecture” of the stapler? (how parts are laid out, functions, arrangement in space) • Liaison Diagram (p.4)

  3. Liaison Diagram • rivet connects anvil to base • pin connects anvil, carrier, and handle • carrier connects pusher and staples

  4. Stapler Example • What are some “Key Characteristics” that could affect function? • In X direction: • position of hammer • thickness of hammer • anvil length • position of pin & holes

  5. Stapler Example • Liaison Diagram with Key Characteristics

  6. Manufacturing and Assembly Variation • Engineering design of an assembly • Nominal design • Variation design • Process design

  7. Nominal Design • Determination of ideal locations and orientations of parts • Defines mutual positioning constraints

  8. Variation Design • Determination of allowable variation in location and orientation • How much variation in each constraint can be tolerated and still achieve the key characteristics?

  9. Process Design • Determination of fabrication and assembly processes that will contribute no more than the tolerable variation • May require loosening allowable variation if no economical process exists

  10. Variation Risk Management (VRM) • Nominal Design, Variation Design, Process Design together make Variation Risk Management • Very hard for many products

  11. Example - Car Doors • Door gap KC • Weatherstripping KC

  12. Car Door Example

  13. Car Door Example • Making a door

  14. Car Doors - Mounting

  15. Car Doors - Mounting

  16. Mathematical Modeling of Assembly • Coordinate frames • each part has a base coordinate frame • Relationships between parts are expressed as 4x4 matrix transforms

  17. Matrix Math • 4x4 matrices relate adjacent frames • Matrix contains rotational part and translational part • Translation occurs first, so rotation does not change position of new frame

  18. Basic Translation and Rotation

  19. Watch Transform Ordering!

  20. Composite Transforms

  21. Nominal Mating of Parts

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