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

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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

Dimensioning Basic Shapes -Simple Shapes Cone 36.4°

Frustum Dimensioning Basic Shapes -Simple Shapes

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)

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.

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

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

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

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.

Assignments Drawing 3

Following are instructor only slides

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 1.0 2.0 1.0 2.0 Φ 1.0

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