Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Dimensioning

1,270 views

Published on

Engineering Drawing

Published in: Education, Technology, Business
  • Be the first to comment

  • Be the first to like this

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 !!!

×