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Chapter 10 Conventional Practice in Section View

Chapter 10 Conventional Practice in Section View. Section view representation of rib , web , spoke and lug . Aligned section. Conventional break. TOPICS. Section view representation of rib , web , spoke and lug. CONVENTIONAL PRACTICE.

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Chapter 10 Conventional Practice in Section View

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  1. Chapter 10 Conventional Practice in Section View

  2. Section view representation of rib, web, spoke and lug. Aligned section Conventional break TOPICS

  3. Section view representation of rib, web, spoke and lug

  4. CONVENTIONAL PRACTICE There are some exceptions to the generalrules of sectioning: • Webs, ribs, lugs, spokes, • Shafts, rods, spindles, • Bolts, nuts and thin washers. • Rivets, dowels, pins andcotters.

  5. CONVENTIONAL PRACTICE The convention in a drawing is to show the preferred method for sectioning this type of object. The cross-section is technically correct. NOT RECOMMENDED CORRECT Convention Rotation

  6. Rib Rib TERMINOLOGY Riband Web are thin, flat feature of an object that acts as a structural support.

  7. Web TERMINOLOGY A web or ribis a strengthining or supporting part of a component.

  8. Hub Hub Rim Spoke Spoke Rim TERMINOLOGY Spoke is the rod radiating from the hub to the rim of a wheel.

  9. TERMINOLOGY Lug is an ear which is built as portion of an object for attachment.

  10. TERMINOLOGY Lug is an ear which is built as portion of an object for attachment.

  11. CONVENTIONAL PRACTICE Omitthe section lines on the section view of • Rib, Web and Lug, if the cutting plane is passed flatwise through. • Spoke, if the cutting plane • is passed longwise through.

  12. CONVENTIONAL PRACTICE • When the cutting plane passes through a rib longtudinally it is not sectioned

  13. CONVENTIONAL PRACTICE • When the cutting plane passes through the rib transversely it should be sectioned

  14. EXAMPLE : RIB Normal multiview drawing Normal section view Section view drawing with convention

  15. EXAMPLE : WEB : flatwise cut Normal multiview drawing Normal section view Section view drawing with convention

  16. EXAMPLE : WEB : crosswise cut

  17. EXAMPLE : WEB : multiple section view

  18. EXAMPLE : SPOKE Misleading impression

  19. EXAMPLE : LUG

  20. Aligned Section

  21. DEFINITION Aligned section is used when features are located on radial lines Aligned section is a section view that is drawn by imaginary rotating the object’s features appeared in a principal view about symmetry axis

  22. Gives the impression that this holes are at unsymmetrical position. Example : Hole

  23. Example : Hole

  24. Example : Rib

  25. Example : Ribs & Holes

  26. Example : Spoke & Keyway Example : Aligned section of keyway

  27. Example :Lug

  28. Conventional Break

  29. For long objects that have to draw in a small scale to fit them on the paper, it is recommended to remove its long portion (which contains no important information) and draw the break lines at the broken ends. CONVENTIONAL PRACTICE

  30. Example SCALE 1:1

  31. Example SCALE 2:1

  32. STANDARD BREAK LINES Wood Rectangular cross section Metal Cylindrical cross section Tubular cross section

  33. 30o R 30o R/3 R/3 TO DRAW CYLINDRICAL BREAK

  34. f16 800 f16 800 TO DIMENSION A BROKEN PART Typical dimensioning method not to scale dimensions

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