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Chapter 10 Conventional Practice  in Section View
TOPICS Section view representation of  rib ,  web ,  spoke  and  lug . Aligned section Conventional break
Section view representation of rib ,  web ,  spoke  and  lug
TERMINOLOGY Rib   and  Web   are  thin ,  flat  feature of an object that acts as a structural support. Rib Rib Web
Spoke   is the rod radiating from the  hub  to the  rim  of a wheel. TERMINOLOGY Rim Spoke Spoke Rim Hub Hub
Lug   is an ear which is built as portion of an object for attachment. TERMINOLOGY
Lug   is an ear which is built as portion of an object for attachment. TERMINOLOGY
CONVENTIONAL  PRACTICE Omit   the section lines  on the section view of ,[object Object],[object Object]
EXAMPLE  :  RIB Normal multiview drawing Normal  section view Section view  drawing with convention
EXAMPLE  :  WEB : flatwise cut Normal multiview drawing Normal  section view Section view  drawing with convention
EXAMPLE  :  WEB : crosswise cut
EXAMPLE  :  WEB : multiple section view
EXAMPLE  :  SPOKE Misleading  impression
EXAMPLE  :  LUG
Aligned  Section
DEFINITION Aligned section  is a section view that is drawn by  imaginary rotating  the object’s features appeared in a principal view about symmetry axis
Example :  Hole Gives the impression that this holes are at unsymmetrical position.
Example :  Hole
Example :  Rib
Example :  Ribs & Holes
Example :  Aligned section of keyway Example :  Spoke & Keyway
Example :   L ug
Conventional  Break
CONVENTIONAL  PRACTICE 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.
SCALE 1:1 Example
Example SCALE 2:1
STANDARD  BREAK  LINES Rectangular cross section Wood Metal Cylindrical cross section Tubular cross section
TO  DRAW  CYLINDRICAL  BREAK R R/3 R/3 30 o 30 o
TO  DIMENSION  A  BROKEN  PART Typical dimensioning method not to scale dimensions 800  16  16 800

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Engineering Drawing: Chapter 10 convention in section

  • 1. Chapter 10 Conventional Practice in Section View
  • 2. TOPICS Section view representation of rib , web , spoke and lug . Aligned section Conventional break
  • 3. Section view representation of rib , web , spoke and lug
  • 4. TERMINOLOGY Rib and Web are thin , flat feature of an object that acts as a structural support. Rib Rib Web
  • 5. Spoke is the rod radiating from the hub to the rim of a wheel. TERMINOLOGY Rim Spoke Spoke Rim Hub Hub
  • 6. Lug is an ear which is built as portion of an object for attachment. TERMINOLOGY
  • 7. Lug is an ear which is built as portion of an object for attachment. TERMINOLOGY
  • 8.
  • 9. EXAMPLE : RIB Normal multiview drawing Normal section view Section view drawing with convention
  • 10. EXAMPLE : WEB : flatwise cut Normal multiview drawing Normal section view Section view drawing with convention
  • 11. EXAMPLE : WEB : crosswise cut
  • 12. EXAMPLE : WEB : multiple section view
  • 13. EXAMPLE : SPOKE Misleading impression
  • 14. EXAMPLE : LUG
  • 16. DEFINITION Aligned section is a section view that is drawn by imaginary rotating the object’s features appeared in a principal view about symmetry axis
  • 17. Example : Hole Gives the impression that this holes are at unsymmetrical position.
  • 18. Example : Hole
  • 19. Example : Rib
  • 20. Example : Ribs & Holes
  • 21. Example : Aligned section of keyway Example : Spoke & Keyway
  • 22. Example : L ug
  • 24. CONVENTIONAL PRACTICE 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.
  • 27. STANDARD BREAK LINES Rectangular cross section Wood Metal Cylindrical cross section Tubular cross section
  • 28. TO DRAW CYLINDRICAL BREAK R R/3 R/3 30 o 30 o
  • 29. TO DIMENSION A BROKEN PART Typical dimensioning method not to scale dimensions 800  16  16 800