Introduction to engineering dimensioning 3
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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 engineering dimensioning 3 l.jpg

Introduction to EngineeringDimensioning - 3

Agenda

Dimensioning cylinders and cones

Locating holes and other features

General guidelines


Dimensioning basic shapes simple shapes l.jpg
Dimensioning Basic Shapes -Simple Shapes

  • Cylinders

    Positive (solid) Negative (hole)

Φmeans diameter


Dimensioning basic shapes simple shapes3 l.jpg

36.4°

Dimensioning Basic Shapes -Simple Shapes

  • Cone


Dimensioning basic shapes simple shapes4 l.jpg
Dimensioning Basic Shapes -Simple Shapes

  • Frustum


Dimensioning shows a size b location and orientation l.jpg
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 l.jpg
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 l.jpg

Preferred

Avoid

Some General Guidelines – Clarity is the goal.

  • Place Dimension in view that most clearly describes feature


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Some General Guidelines – Clarity is the goal.

  • Dimension Outside of View

Avoid

Good Practice


Some general guidelines l.jpg
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 l.jpg
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 l.jpg
Assignments

  • Drawing 3



Practice problem 1 assume block is 2 in square and hole is 1 in diameter13 l.jpg

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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