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7-11 Locating Dimensions

There are eight general rules concerning the location of dimensions. See Figure 7-55.

  • 1 Locate dimensions near the features they are defining.

  • 2 Do not locate dimensions on the surface of the object.

  • 3 Align and group dimensions so that they are neat and easy to understand.

  • 4 Avoid crossing extension lines.

Sometimes it is impossible not to cross extension lines because of the complex shape of the object, but whenever possible, avoid crossing extension lines.

  • 5 Do not cross dimension lines.

  • 6 Locate shorter dimensions closer to the object than longer dimensions.

  • 7 Always locate overall dimensions the farthest away from the object.

  • 8 Do not dimension the same distance twice. This is called double dimensioning and will be discussed in Chapter 8 in association with tolerancing.

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