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Chapter 10 Conventional Practice in Section View.

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Presentation on theme: "Chapter 10 Conventional Practice in Section View."— Presentation transcript:

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 CONVENTIONAL PRACTICE There are some exceptions to the general rules of sectioning:  Webs, ribs, lugs, spokes,  Shafts, rods, spindles,  Bolts, nuts and thin washers.  Rivets, dowels, pins and cotters.

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

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

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

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

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

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

11 CONVENTIONAL PRACTICE  Rib, Web and Lug, if the cutting plane is passed flatwise through. Omit the section lines on the section view of  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 Example : Hole Gives the impression that this holes are at unsymmetrical position.

23 Example : Hole

24 Example : Rib

25 Example : Ribs & Holes

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

27 Example : L ug

28 Conventional Break

29 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.

30 SCALE 1:1 Example

31 SCALE 2:1

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

33 TO DRAW CYLINDRICAL BREAK R R/3 30 o

34 800 TO DIMENSION A BROKEN PART Typical dimensioning method  16 not to scale dimensions 


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