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Introduction to Engineering Dimensioning - 3

Introduction to Engineering Dimensioning - 3. Agenda Dimensioning cylinders and cones Locating holes and other features General guidelines. Dimensioning Basic Shapes -Simple Shapes. Cylinders Positive (solid) Negative (hole). Φ means diameter. 36.4 °.

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Introduction to Engineering Dimensioning - 3

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  1. Introduction to EngineeringDimensioning - 3 Agenda Dimensioning cylinders and cones Locating holes and other features General guidelines

  2. Dimensioning Basic Shapes -Simple Shapes • Cylinders Positive (solid) Negative (hole) Φmeans diameter

  3. 36.4° Dimensioning Basic Shapes -Simple Shapes • Cone

  4. Dimensioning Basic Shapes -Simple Shapes • Frustum

  5. Dimensioning Shows A) Size & B) Location and Orientation Size Location & Orientation When locating a hole, or positive cylinder, dimension to the center line (See B & C above)

  6. Principles of Good Dimensioning (Table 4.1 ) • The overriding principle of dimensioning is CLARITY • Principles – not an infallible rule set, need to apply good judgment.

  7. Preferred Avoid Some General Guidelines – Clarity is the goal. • Place Dimension in view that most clearly describes feature

  8. Some General Guidelines – Clarity is the goal. • Dimension Outside of View Avoid Good Practice

  9. Some General Guidelines • Start by dimensioning basic outside dimensions of the object. • Add dimension for location and size of removed features • Add general and specific notes – such as tolerances

  10. Practice Problem 1 – Assume block is 2 in square and hole is 1 in diameter Size: Ht, Wt, Depth, Hole Dia. Location: Center of Hole * There is a full-page reproduction following the lecture notes for your use.

  11. Assignments • Drawing 3

  12. Following are instructor only slides

  13. 2.0 1.0 Φ 1.0 2.0 1.0 Practice Problem 1 – Assume block is 2 in square and hole is 1 in diameter Size: Ht, Wt, Depth, Hole Diameter. Location: Center of Hole 1.5

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