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Engineering drawings

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• Show how two or more parts of an assembly fit together Allow you to see where parts are assembled by providing &apos;centre lines&apos; that you can &apos;follow&apos; (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
• To remember the projection angle rotate the rear of the cone to the right and draw what you see
• To remember the projection angle rotate the rear of the cone to the right and draw what you see
• Transcript

• 1. Engineering Drawings Gary Trowles
• 2. ISOMETRIC DRAWINGS
• Three dimensional picture of a component or assembly
• Shows three surfaces of an assembly in one view
• 3. ISOMETRIC DRAWINGS
• Vertical lines are shown in a vertical position
• Horizontal lines are drawn at 30 degrees to the horizontal.
• 4. ISOMETRIC DRAWINGS
• A technique called exploded views is used to show more clearly how the parts of an assembly fit together.
• 5. ORTHOGRAPHIC PROJECTION
• 1 ST Angle
• Projection
• 6. 1 st Angle Projection (Europe)
• 7. ORTHOGRAPHIC PROJECTION
• 3 rd Angle
• Projection
• 8. 3 rd Angle Projection
• 9. Try to visualise this part....
• 10. Which block represents the part?
• 11. Line types
• Visible lines - 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.
• 12.