Introduction to Engineering Dimensioning - 3

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