Download - Section views
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Chapter 8
Section Views
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TOPICS
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Introduction
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ObjectGRAPHICS COMMUNICATION WITH ENGINEERING DRAWINGWorking drawingOrthographicprojection(convention)Section viewsconventionSection ViewsFinishYesNo
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PURPOSES OFSECTION VIEWS reducing or eliminating the hidden lines. revealing the cross sectionals shape.
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EXAMPLE : Advantage of using a section view.
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Terminology andcommon practices
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CUTTING PLANECutting plane is a plane that imaginarily cutsthe object to reveal the internal features.
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Cutting plane line is an edge view of the cutting plane.CUTTING PLANE LINEIndicate the pathof cutting plane.
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ANSIstandardThick lineThick lineJIS & ISOstandardThin lineCUTTING PLANE LINESTYLESThis course
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SECTION LININGSection lines or cross-hatch lines are used toindicate the surfaces that are cut by the cuttingplane.Drawn with 4H pencil.
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SECTION LINES SYMBOLSCast iron,Malleable ironSteelConcreteSandWood
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SECTION LINING PRACTICECOMMON MISTAKE
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SECTION LINING PRACTICECOMMON MISTAKE
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Kinds of Sections
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KIND OF SECTIONS1. Full section2. Offset section3. Half section4. Broken-out section5. Revolved section (aligned section)6. Removed section (detailed section)
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FULL SECTION VIEWThe view is made by passing the straight cutting plane completely through the part.
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OFFSET SECTION VIEWThe view is made by passing the bended cutting plane completely through the part.Do not show the edge viewsof the cutting plane.
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TREATMENT OF HIDDEN LINES
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HALF SECTION VIEWThe view is made by passing the cutting plane halfway through an object and remove a quarter of it.
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HALF SECTION VIEW
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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
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BROKEN-OUT SECTION VIEW
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EXAMPLE : Comparison among several section techniques
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REVOLVED SECTION VIEW
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REVOLVED SECTION VIEWBasic concept
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REVOLVED SECTION VIEWBasic concept
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GivenStep 1a. Assign position of cutting plane.b. Draw axis of rotation in front view.Steps in constructionREVOLVED SECTION VIEW
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Steps in constructionGivena. Transfer the depth dimension to the front view.REVOLVED SECTION VIEWStep 2
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Steps in constructionGivenREVOLVED SECTION VIEWa. Draw the revolved section.Step 3b. Add section lines.
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Steps in constructionGivenREVOLVED SECTION VIEWFINAL PICTURE
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Placement of revolved section1. Superimposed to orthographic view.SuperimposedBreak2. Break from orthographic view.REVOLVED SECTION VIEW
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6. Removed sectionREMOVED SECTION VIEW
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Example : Revolved vs. removed sections.Revolved sectionRemoved sectionREMOVED SECTION VIEW
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Example : Situation that removed section is preferred.REMOVED SECTION VIEWPreferredPoorToo messy !!
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Example : Multiple removed section viewsREMOVED SECTION VIEWSECTION A A SECTION B B
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Dimensioningin Section View
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In most cases, dimensioning of the section viewsfollows the typical rules of dimensioning.GOODPOOR
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GOODPOORDIMENSIONING
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For a half-section view,use dimension line withonly one arrowhead thatpoints to the position insidethe sectioned portion.f 50DIMENSIONING