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Changes to assessment: Engineering, D&T, PDT Ignore section (b) and (c) week 4 ATI see new sheet

Changes to assessment: Engineering, D&T, PDT Ignore section (b) and (c) week 4 ATI see new sheet. Week 2 Orthographic Projection & Sectional Views . First Angle Third Angle Sectional views. Plan View. End Elevation (Right). Front Elevation. End Elevation (Left). Plan View.

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Changes to assessment: Engineering, D&T, PDT Ignore section (b) and (c) week 4 ATI see new sheet

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  1. Changes to assessment: Engineering, D&T, PDT Ignore section (b) and (c) week 4 ATI see new sheet

  2. Week 2 Orthographic Projection & Sectional Views

  3. First Angle • Third Angle • Sectional views

  4. Plan View End Elevation (Right) Front Elevation End Elevation (Left)

  5. Plan View End Elevation (Left) End Elevation (Right) First Angle Front Elevation

  6. Outlines Construction Hidden Centre Section Linework

  7. First Angle

  8. Plan View End Elevation (Left) End Elevation (Right) Third Angle Front Elevation

  9. Note: • six views in total may be derived from any shape • only draw a maximum of three

  10. Symbols Derived from a truncated cone:

  11. Page Layout:

  12. Construction:

  13. Construction:

  14. Construction:

  15. Construction:

  16. Construction:

  17. Construction:

  18. Sectional Views

  19. Background • Produced when one imagines the component to be cut through a defined cutting plane

  20. Cutting plane and direction of viewing is defined on a non-sectional view using chain lines thickened at each end The direction of viewing indicated as shown by arrows

  21. Reasons for sectioning • to illustrate internal features • to reduce number of hidden detail lines • to allow internal features to be dimensioned • to show relative position of parts in an assembly

  22. Cutting plane indicated with 45º (or other), equidistant 4mm hatching

  23. Two adjacent parts hatched in opposite directions • More than two parts then different spacing used (smaller parts usually have closer hatching) • Large areas of hatching usually not filled in

  24. Parallel section planes have no effect on hatching

  25. Parallel section planes have no effect on hatching

  26. Sectioning exceptions Some shapes are not sectioned even if they lie in the sectioning plane. The following shapes when cut longitudinally are not sectioned: Shafts, keys, rivets, ribs, pins, bolts, spokes, nuts, webs, washers

  27. Shaft Web

  28. Orthographic Sections

  29. Section of an Assembly

  30. Omit hidden lines from sectional views of a component!

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