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Engineering drawings
The document discusses various types of engineering drawings including isometric drawings, which show a three-dimensional view of a component or assembly from three surfaces in one view. It also covers orthographic projections, which use front, top, side, and other views to represent a three-dimensional object in two dimensions. The document explains techniques for drawing boxes, more complex shapes, threaded parts, and using section views to show hidden details. It also discusses dimensions, title blocks, line types, and other aspects of creating technical drawings.
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Engineering drawings
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- 2. ISOMETRIC DRAWINGS Three dimensionalpicture of a component or assembly Shows three surfaces of an assembly in one view
- 3. ISOMETRIC DRAWINGS Vertical linesare shown in a vertical position Horizontal lines are drawn at 30 degrees to the horizontal. 30° 30°
- 4. ISOMETRIC DRAWINGS A techniquecalled exploded views is used to show more clearly how the parts of an assembly fit together.
- 5. Isometric projection :Drawing a box 1.Draw the front vertical edge of the cube. 2.The sides of the box are drawn at 30 degrees to the horizontal to the required length.
- 6. Isometric projection :Drawing a box 3.Draw in the back verticals. 4.Drawn in top view with all lines drawn 30 degrees to the horizontal.
- 7. Isometric projection :Drawing more complicated shapes 5 1 3 5 5 1
- 8. Isometric projection :Drawing more complicated shapes Draw a guide box. The box is the size of the maximum dimensions. In this case, 5 long, 3 wide, and 5 high. Draw the box in very lightly. 5 5 3
- 9. Isometric projection :Drawing more complicated shapes Draw a box 4 x 1 x 5, the shape that needs to be removed from the box to create the shape we require. Draw the box in very lightly.
- 10. Isometric projection :Drawing more complicated shapes Now draw in the outline of the object using a heavier line. Using this technique you can draw complex shapes accurately because you can use the guide box as a means to measure your engineering drawing views.
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- 13. Six views oforthographic projection
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- 26. 3rd Angle Projection THIRD ANGLEORTHOGRAPHIC PROJECTION
- 27. 3rd Angle Projection THIRD ANGLEORTHOGRAPHIC PROJECTION
- 28. Difference between 1st and3rd angle Bottom view Right view Rear viewLeft view Top view Front view Bottom view Top view Front view Right viewLeft view Rear view
- 29. Try to visualisethis part....
- 30. Which block representsthe part? (C) (B)(A) (D) (C)
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- 33. Line types Visiblelines - solid lines that show visible edges and surfaces. Hidden lines - short dashes that show edges and surfaces not visible in that view. Centre Lines - alternate long and short dashes. show the centre of a circle, a shaft, or other symmetrical part. Extension lines - solid lines that indicate where dimensions start and end. Dimension lines - arrows on either side of a dimension showing where it starts and ends.
- 34. Cutting Plane line CuttingPlane line for short distances AA AA Cutting plane line – can be thick alternately long and double short dashes or thick medium dashed lines ending in arrow heads. Used to define sections for sectional views. Arrow heads indicate the direction of viewing.
- 35. Section lines A A B B Section AA Section BB Sectionlines – are thin lines in a parallel pattern used to indicate surfaces in section views resulting from “cutting.” Section lines are commonly referred to as “cross- hatching.”
- 36. Is this drawing 1st or3rd angle?
- 37. Sectional views Sections andsectional views are used to show hidden detail more clearly Created by using a cutting plane to cut the object A section view shows how the object would appear if it was cut along the line of the cutting plane.
- 38. Sectional views Sectional viewsare produced to: clarify details show internal features clearly reduce number of hidden detail lines aid dimensioning show cross-section shape clarify an assembly
- 39. Sectional view toshow internal features and clarify an assembly
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- 75. Question 1 Hole Shaft Basic Size Upper tol Lower tol Max size Min size Basic Size Upper tol Lower tol Max size Min size 40+0.025 -0.000 40.025 40.000 40 -0.009 -0.025 39.991 39.975 90 +0.030 -0.000 90.030 90.000 90 -0.010 -0.029 89.990 89.971
- 76. Question 2 Hole Shaft Basic Size Upper tol Lower tol Max size Min size Basic Size Upper tol Lower tol Max size Min size 35+0.021 -0.000 35.021 35.000 35 +0.015 +0.002 35.015 35.002 85 +0.030 -0.000 85.030 85.000 85 +0.021 +0.002 85.021 85.002
- 77. Question 3 Hole Shaft Basic Size Upper tol Lower tol Max size Min size Basic Size Upper tol Lower tol Max size Min size 45+0.025 -0.000 45.025 45.000 45 +0.042 +0.026 45.042 45.026 95 +0.030 -0.000 95.030 95.000 95 +0.051 +0.032 95.051 95.032
Editor's Notes
- #3 Will show two sides and the top or the bottom.
- #4 When drawn at 30 degrees all lines can be drawn to their true length.
- #5 Show how two or more parts of an assembly fit together Allow you to see where parts are assembled by providing 'centre lines' that you can 'follow' (with your eyes or fingers) Locate component parts or subassemblies within an assembly Show how one component part or subassembly is assembled to another Aid you in visualising what the text of the Process plan says you must do next in the assembly sequence Show how an assembly could be taken apart, e.g. a repair situation
- #18 1st Angle mnemonic The Object comes first, (in front of the paper) 3rd Angle mnemonic The object comes third, (eye, paper, object)
- #19 To remember the projection angle rotate the rear of the cone to the right and draw what you see
- #24 To remember the projection angle rotate the rear of the cone to the right and draw what you see
- #30 This is third angle projection
- #37 It’s 3rd angle