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# Dimensioning

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Engineering Drawing

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### Dimensioning

1. 1. Chapter 9 Dimensioning  Graphical entities on engineering drawings describe shape and position;  Dimensions describe the size and location of features of an object.
2. 2. The thick lines used for the figures The thin ,solid lines used for the dimensions The extension lines are thin, dark, solid . A gap about 1.5mm out of the object
3. 3. The shape dimensions 45 Φ20 10 43 24 Length, width, height, diameter width height length
4. 4. The position dimensions 55 85 60 15 32 20 12 2×Φ10
5. 5. 45 23 29 18 29 18 45 23 OK ! NO !  The shorter dimensions are nearest to the object outline.  Dimension lines should not cross extension lines.
6. 6. OK! NO!  Dimension should be lined up and grouped together as much as possible.
7. 7. 3.2 1.20.8  In crowded conditions, gaps may be left in extension lines.
8. 8. 12 36 40 25 12 36 40 25 correct Poor practice  In general, avoid dimensioning to hidden lines.
9. 9. ￠ 19 ￠ 19 ￠ 19 ￠ 19 ￠ 19 Too small angle ￠ 19 NO ! CORRECT !
10. 10. If radian< ,not diameter, radius!!!! 0 180 R23.5 R6 R3 R0.5
11. 11. ￠ 19 ￠ 19 PREFERED POOR PRACTICE  Dimensions should not be placed on a view unless doing so promotes the clearness of the drawing --- placed outside the view.
12. 12.  The vertical dimensions (height) are placed between front and side views.  The horizontal dimensions (length) are placed between top and front views.  The width dimensions are placed on top or side views.
13. 13. 28 10 54 20 38 20R34￠ 22 R34 20 38 28 20 54 10 CORRECT NO  The dimensions should be given where the shapes are shown clearly !!!