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Can you guess what is inside of this box? How can a Designer show on a drawing what is hidden from view? If you had the Invisible Women’s powers you could.

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Presentation on theme: "Can you guess what is inside of this box? How can a Designer show on a drawing what is hidden from view? If you had the Invisible Women’s powers you could."— Presentation transcript:

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2 Can you guess what is inside of this box? How can a Designer show on a drawing what is hidden from view? If you had the Invisible Women’s powers you could make the box invisible and see what is hidden from view. This is done by using the technique of drawing… SECTION VIEWS This is done by using the technique of drawing… SECTION VIEWS

3 A Section Drawing of a V-Type Four Stroke Diesel Engine Section Views: Section Views: are used to show inside features of objects that would otherwise be unseen.

4 The Unit Organizer LAST UNIT/ Experience Basic Dimensioning CURRENT UNIT PRODUCE SECTION VIEW DRAWINGS NEXT UNIT/ Experience Auxiliary Views Techniques used on Working Detail Drawings The Big Picture 1.What determines the need for a section view? 2.What are some types of section views? 3.How are webs, ribs and spokes represented in a section view? And why? UNIT SELF-TEST QUESTIONS UNIT RELATIONSHIPS Have many types Are Labeled by When omitted Section Views Inside feature are not visible Types of Section Views C.P.L. Elements & Placement Principles & Exceptions Section Lines (X-Hatch) Are identified by Required When Hand out Unit organizers

5 LAST UNIT/ Experience Basic Dimensioning CURRENT UNIT PRODUCE SECTION VIEW DRAWINGS NEXT UNIT/ Experience Auxiliary Views 2-col note vocab Hand-outs worksheets Jeopardy Game Drawings Quizzes Unit Test The Unit Organizer UNIT SCHEDULE Section Views Inside feature are not visible Types of Section Views C.P.L. Elements & Placement Principles & Exceptions Section Lines (X-Hatch) Techniques used on Working Detail Drawings The Big Picture 1.What determines the need for a section view? 2.What are some types of section views? 3.How are webs, ribs and spokes represented in a section view? And why? UNIT SELF-TEST QUESTIONS UNIT RELATIONSHIPS Have many types Are Labeled by Are identified by When omitted Required When

6 Objectives Explain why section views are necessary. Explain and accurately draw a cutting- plane line and X-hatch (cross-hatch) lines. Full sectionHalf section Offset section Recognize and appropriately use the following section view types on a drawing: Full section, Half section and Offset section.

7 Section Views: inside features Section Views: are used to show inside features of objects that would otherwise be unseen.

8 Why Use Section Views? How can we dimension to these interior features without using the hidden lines?

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10 ANSI standard Thick line JIS & ISO standard Thin line CUTTING PLANE LINESTYLES Viewing direction Viewing direction Viewing direction This course

11 SECTION LINING Section lines or cross-hatch lines are used to indicate the surfaces that are cut by the cutting plane. Section lines Drawn with thin dark lines 45 degree angle usually at a 45 degree angle.

12 SECTION LINES SYMBOLS The section lines are different for each of material types. Cast iron, Malleable iron Steel Concrete Sand Wood For practical purposes, the cast iron symbol is used most often for any materials.

13 SECTION LINING PRACTICE 125 The spaces between lines may vary from.125 inches.25 for small sections to.25 inches for large sections. COMMON MISTAKE

14 SECTION LINING PRACTICE should not Section lines should not be drawn parallel or perpendicular to contour of the view. COMMON MISTAKE

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16 FULL SECTION VIEW straight The view is made by passing the straight cutting plane completely through the entire part.

17 HALF SECTION VIEW The view is made by passing the cutting plane halfway through an object and removing a quarter of it.

18 HALF SECTION VIEW A center line is used to separate the sectioned half from the unsectioned half of the view. Hidden lines are omitted in the unsectioned half of the view.

19 OFFSET SECTION VIEW The view is made by passing the bended cutting plane completely through the part. Do not show the edge views of the cutting plane.

20 The Unit Organizer LAST UNIT/ Experience Basic Dimensioning CURRENT UNIT PRODUCE SECTION VIEW DRAWINGS NEXT UNIT/ Experience Auxiliary Views 2-col note vocab Hand-outs worksheets Jeopardy Game Drawings Quizzes Unit Test UNIT SCHEDULE Section Views Inside feature are not visible Types of Section Views C.P.L. Elements & Placement Principles & Exceptions Section Lines (X-Hatch) Techniques used on Working Detail Drawings The Big Picture 1.What determines the need for a section view? 2.What are some types of section views? 3.How are webs, ribs and spokes represented in a section view? And why? UNIT SELF-TEST QUESTIONS UNIT RELATIONSHIPS To show the inside features of mech. parts Full section Half section Offset section Line types Arrows Labeling Surfaces Direction Spacing Angle Material specifications Required When Have many types Are Labeled by Are identified by When omitted

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22 Objectives Removed sectionRevolved sectionBroken-out section Recognize and appropriately use the following section view types on a drawing: Removed section, Revolved section and Broken-out section. Explain how hidden lines are used in section views. RibsWebsSpokes Lugs Accurately draw Ribs, Webs, Spokes and Lugs in section views.

23 Example : Revolved vs. removed sections. Revolved section Removed section REMOVED SECTION VIEW

24 Example : Situation that removed section is preferred. REMOVED SECTION VIEW Preferred Poor Too messy !!

25 Example : Multiple removed section views REMOVED SECTION VIEW A A B B SECTION A – A SECTION B – B

26 REVOLVED SECTION VIEW Basic concept

27 Given Step 1 a. Assign position of cutting plane. b. Draw axis of rotation in front view. Steps in construction REVOLVED SECTION VIEW Edge view of cross-section

28 Steps in construction Given a. Transfer the depth dimension to the front view. REVOLVED SECTION VIEW Step 2

29 Steps in construction Given REVOLVED SECTION VIEW a. Draw the revolved section. Step 3 b. Add section lines.

30 Steps in construction Given REVOLVED SECTION VIEW FINAL PICTURE

31 Placement of revolved section 1. Superimposed to orthographic view. SuperimposedBreak 2. Break from orthographic view. REVOLVED SECTION VIEW

32 The view is made by passing the cutting plane normal to the viewing direction and removing the portion of an object in front of it. BROKEN-OUT SECTION VIEW

33 EXAMPLE : Comparison among several section techniques

34 The Unit Organizer LAST UNIT/ Experience Basic Dimensioning CURRENT UNIT PRODUCE SECTION VIEW DRAWINGS NEXT UNIT/ Experience Auxiliary Views 2-col note vocab Hand-outs worksheets Jeopardy Game Drawings Quizzes Unit Test UNIT SCHEDULE Section Views Inside feature are not visible Types of Section Views C.P.L. Elements & Placement Principles & Exceptions Section Lines (X-Hatch) Techniques used on Working Detail Drawings The Big Picture 1.What determines the need for a section view? 2.What are some types of section views? 3.How are webs, ribs and spokes represented in a section view? And why? UNIT SELF-TEST QUESTIONS UNIT RELATIONSHIPS To show the inside features of mech. parts Full section Half section Offset section Removed section Revolved section Broken-out section Aligned section Line types Arrows Labeling Surfaces Direction Spacing Angle Material specifications Required When Have many types Are Labeled by Are identified by When omitted

35 TREATMENT OF HIDDEN LINES Hidden lines are normally omitted from section views.

36 The Unit Organizer LAST UNIT/ Experience Basic Dimensioning CURRENT UNIT PRODUCE SECTION VIEW DRAWINGS NEXT UNIT/ Experience Auxiliary Views 2-col note vocab Hand-outs worksheets Jeopardy Game Drawings Quizzes Unit Test UNIT SCHEDULE Section Views Inside feature are not visible Types of Section Views C.P.L. Elements & Placement Principles & Exceptions Section Lines (X-Hatch) Techniques used on Working Detail Drawings The Big Picture 1.What determines the need for a section view? 2.What are some types of section views? 3.How are webs, ribs and spokes represented in a section view? And why? UNIT SELF-TEST QUESTIONS UNIT RELATIONSHIPS To show the inside features of mech. parts Full section Half section Offset section Removed section Revolved section Broken-out section Aligned section Line types Arrows Labeling Surfaces Direction Spacing Angle Material specifications Ribs, Webs, Spokes, hidden lines & dimensions Required When Have many types Are Labeled by Are identified by When omitted

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38 RIBS AND WEBS RibsWebs Ribs and Webs are thin, flat features of an object used for bracing or adding strength. Rib Web

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

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

41 EXAMPLE : WEB : crosswise cut

42 EXAMPLE : WEB : multiple section view

43 Rim Spoke : Spoke : One of several bars attaching a hub to the rim of a wheel Spoke Rim Hub SPOKES

44 EXAMPLE : SPOKE Misleading impression

45 Lug: Lug: An ear-like projection used for attachment. LUGS

46 LUGS

47 EXAMPLE : LUG

48 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.

49 Aligned Section

50 Objectives RXxxXXx XxxxxxxxxxxxxxxxXxxx X xxx xxxxxxxxxxxx

51 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

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

53 Example : Hole

54 Example : Rib

55 Example : Ribs & Holes

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

57 Example : L ug

58 Conventional Break

59 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.

60 SCALE 1:1 Example

61 SCALE 2:1

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

63 TO DRAW CYLINDRICAL BREAK R R/3 30 o

64 800 TO DIMENSION A BROKEN PART Typical dimensioning method  16 not to scale dimensions 

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