SECTION VIEWS What is a section view See

SECTION VIEWS What is a section view? � See inside an object. Why section view? � Complex interior geometry. � clarify the interior construction � Can’t clearly described by hidden lines

SECTIONAL VIEWS The idea is … � Make an imaginary cut � Removing a portion � Inside is seen more clearly.

SECTIONAL VIEWS What is this? An ugly rock?

SECTIONAL VIEWS A pretty rock?

CREATING A SECTION VIEW The part is cut using an imaginary cutting plane.

CREATING A SECTION VIEW The unwanted portion is mentally discarded exposing the interior construction.

SECTION EXAMPLE Sectional view label Notice how the cut material is shown. Notice how the cutting plane is indicated.

LINES USED IN SECTION VIEWS Cutting Plane Line: Used to show where the object is being cut.

CONT… Shows where the part is being cut. Arrows point to the portion being kept. Section Lines (hatch)

CONT… Section Lines (cross hatch): Indicate where the cutting plane cuts the material. � Section lines are thin lines. � Section line symbols are chosen according to the material of the object � Section lines are generally drawn at a 45 angle.

LINES USED IN SECTION VIEWS Common Cross Hatch Symbols

RULES OF SECTIONING Rule 1: A section lined (hatched) area is always completely bounded by a visible outline.

RULES OF SECTIONING Rule 2: The section lines (hatch) in all areas should be parallel.

RULES OF SECTIONING Rule 3: All the visible edges behind the cutting plane should be shown.

RULES OF SECTIONING Rule 4: Hidden features should be omitted in all areas of a section view.

RIB AND WEB SECTIONS To avoid a false impression of thickness and solidity, ribs and webs are not sectioned. No section lines in cut area of web

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RIB AND WEB SECTIONS If the cutting plane passes crosswise through the rib or web, we include section lines. Cutting plane passes through the web Section lines in cut area of web

TYPES OF SECTIONS 1. Full Section 2. Half Section 3. Offset Section 4. Broken-Out Section 5. Revolved Section 6. Removed Section 19

FULL SECTION 20

HALF SECTION 21

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OFFSET SECTION 23

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BROKEN-OUT SECTION 25

REVOLVED SECTION &REMOVED SECTION 26

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D 20 A R 20 10 14 20 10 80 13 X 40 A

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17 � 20 ø 12 44 R 18 R 12 ø R 15 6 60

A A 43

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A 45 A

A 46

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A 52 A

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57

58

59

60

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104 A 30 90 74 60 40 R 7 R 10 28 20 A 37 74

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65

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