Chapter 10 Convention in section

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Slide1:

Chapter 10 Conventional Practice in Section View

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

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Section view representation of rib , web , spoke and lug

TERMINOLOGY:

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

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

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

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

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CONVENTIONAL PRACTICE Omit the 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.

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

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

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EXAMPLE : WEB : crosswise cut

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EXAMPLE : WEB : multiple section view

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EXAMPLE : SPOKE Misleading impression

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EXAMPLE : LUG

Aligned Section:

Aligned Section

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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

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

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Example : Hole

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Example : Rib

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Example : Ribs & Holes

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Example : Aligned section of keyway Example : Spoke & Keyway

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Example : L ug

Conventional Break:

Conventional Break

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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.

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SCALE 1:1 Example

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Example SCALE 2:1

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

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

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

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