Presentation is loading. Please wait.

Presentation is loading. Please wait.

Engineering Graphics IV Prof. Paul Kurowski October 30, 2012.

Similar presentations


Presentation on theme: "Engineering Graphics IV Prof. Paul Kurowski October 30, 2012."— Presentation transcript:

1 Engineering Graphics IV Prof. Paul Kurowski October 30, 2012

2 Engineering Graphics IV Section Views Auxiliary Views Dimensioning Tolerancing

3 Section Views

4 Clearly show interior features Avoid confusing hidden lines

5 Cutting Planes Cutting planes define section views Lines of sight are perpendicular to the cutting plane Section views are parallel to cutting plane and perpendicular to lines of sight Objects shown in true size Cut surface is cross- hatched

6

7

8 Cutting Plane Lines Show where cutting plane passes through object Represent edge view of cutting plane Appear in views adjacent to section view

9 Full Section

10 Half Section

11 Offset Section

12 Broken Out Section

13 Sketch Section View

14 Solution E-drawing

15 Sketch Section View

16 Solution

17 Cross Hatching (Section Lines) General symbol (cast iron) used for most purposes and for sketching Section lines are normally drawn at 45° from the horizontal but can be changed for adjacent parts in the same section Normally section lines are not shown on thin parts Components like bolts are usually not sectioned

18 A)Cast Iron/ B) Sound C) Thermal General Insulation Insulation D) Water E) Steel F) Titanium/ Refractory Material G) Concrete H) Wood (across/along grain)

19 Auxiliary Views

20 What is an Auxiliary view? It is an extra view of an object It is used when the 6 principal views don’t describe an object (or some of its features) clearly or completely - in particular inclined features It is used to show the true lengths of lines It is used to show the true size of planes

21 Why use an Auxiliary View? None of these views shows the angled face in true size and shape.

22 An extra view is needed.

23 Constructing an auxiliary view It is an orthographic projection Lines of sight are perpendicular to the plane of the feature (or object) The projection plane is perpendicular to the lines of sight and parallel to the plane of the feature

24 Auxiliary Views

25 - Dimension on true size and shape views only - Use Auxiliary views if necessary NO YES

26 Question Which of the following is NOT true of an auxiliary view? A. They are used to show the true size and shape of features B. They are orthographic projections C. They are used to replace the traditional multiviews D. They are used when the traditional multiviews do not fully describe the object

27 Question Which of the following is NOT true of an auxiliary view? A. They are used to show the true size and shape of features B. They are orthographic projections C. They are used to replace the traditional multiviews D. They are used when the traditional multiviews do not fully describe the object

28 Dimensioning

29 Multi-view Drawing Specify: Size of features Location of features Details and notes

30 Dimensioning Dimensioning is necessary to specify: Size of features Location of features Details and notes for construction or manufacture Dimensioning is important in the communication of the design, from the designer to the manufacturer/contractor to the quality control inspection

31 Dimensioned Multi-View Drawing Units must be stated Typically inches or millimeters Mixed dimensions sometimes used

32 Terminology and Standards Leave gap Note arrow direction Limits indicate tolerance

33 Terminology and Standards Use diameter for circles, radius for arcs Show extra dimensions as reference only (or better, omit) Plus/minus indicates tolerance

34 Question Why are dimensions used? A. To specify the size of features B. To specify the location of features C. To specify details and notes for construction or manufacture D. To fully communicate the design E. All of the above

35 Question Why are dimensions used? A. To specify the size of features B. To specify the location of features C. To specify details and notes for construction or manufacture D. To fully communicate the design E. All of the above

36 Good Drafting Practices Dimensioning

37

38

39 Show all necessary views Bottom view shows important features Make sure center lines are shown in all views!

40 Make sure views are aligned NO YES

41 Don’t dimension hidden lines NO YES Dimension visible lines if possible

42 Dimension to centre lines of cylindrical features and holes NO YES Remember to show centre lines!

43 Dimension the most descriptive view

44 Don’t over or under- dimension Show necessary dimensions exactly once All dimensions can be derived from given dimensions Don’t show the same dimensions different ways

45 Don’t over-dimension NO YES

46 Don’t crowd dimensions NO YES

47 Extension lines should not cross dimension lines NO YES

48 - Dimension on true size and shape views only - Use Auxiliary views if necessary NOYES

49 Add Dimensions

50 Solution More than one solution is possible

51 Add Dimensions

52 Solution

53 Add Dimensions

54 Solution


Download ppt "Engineering Graphics IV Prof. Paul Kurowski October 30, 2012."

Similar presentations


Ads by Google