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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. 36.4 °.

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### Introduction to EngineeringDimensioning - 3

Agenda

Dimensioning cylinders and cones

Locating holes and other features

General guidelines

Dimensioning Basic Shapes -Simple Shapes

• Cylinders

Positive (solid) Negative (hole)

Φmeans diameter

36.4°

Dimensioning Basic Shapes -Simple Shapes

• Cone

Dimensioning Basic Shapes -Simple Shapes

• Frustum

Size Location & Orientation

When locating a hole, or positive cylinder, dimension to the center line (See B & C above)

• The overriding principle of dimensioning is CLARITY

• Principles – not an infallible rule set, need to apply good judgment.

Avoid

Some General Guidelines – Clarity is the goal.

• Place Dimension in view that most clearly describes feature

Some General Guidelines – Clarity is the goal.

• Dimension Outside of View

Avoid

Good Practice

• 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.

• Drawing 3

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

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