dimensioning def

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Technical Design Technical Design Dimensioning Dimensioning

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Page 1: Dimensioning def

Technical DesignTechnical Design DimensioningDimensioning

Page 2: Dimensioning def

International Systems of Representation

Each view is located where it’s seen from

Each view is projected to the opposite plane

Page 3: Dimensioning def

1. Dimensions should NOT be duplicated, or the same information given in two different ways.

Incorrect

Incorrect Parallel location

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1-1. Another possibility for aligned dimensions:

Incorrect

Incorrect Serial location

Page 5: Dimensioning def

2. No unnecessary dimensions should be used – only those needed to produce or inspect the part.

Incorrect

Page 6: Dimensioning def

3. Dimensions should be attached to the view that best shows the contour of the feature to be dimensioned, usually the front view.

Incorrect

Incorrect

Page 7: Dimensioning def

4. Whenever possible, avoid dimensioning to hidden lines and features.

Incorrect

Page 8: Dimensioning def

5. Avoid dimensioning over or through the object.

Incorrect

Page 9: Dimensioning def

6. A dimension should be attached to only one view; for example, extension lines should not connect two views.

Incorrect

Page 10: Dimensioning def

7. Whenever possible, locate dimensions between adjacent views and avoid sending extension lines through object views.

Incorrect

Page 11: Dimensioning def

Correct dimensioning

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8. In general, a circle is dimensioned by its diameter and an arc by its radius.

Holes are located by their centerlines, which may be extended and used as extension lines

Page 13: Dimensioning def

9. Holes should be located and sized in the view that shows the feature as a circle.

Incorrect

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10. Do not cross a dimension line with an extension line, and avoid crossing dimensions with leader lines.

Incorrect

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11. Leader lines point toward the center of the feature, and should not occur horizontally or vertically.

IncorrectCorrect