Orthographic & Isometric Drawing Lesson

1 Orthographic & IsometricDrawing LessonTechnological DesignMr. WadowskiTOPICSG lass box conceptLine convention (The meaning of lines in Orthographic Drawings) Orthographic projection of point, line , plane, surfaceand Drawings, Isometric Drawings & Orthographic DrawingsMultiview projectionTOPICS (continued) Drawing with a Miter LineDimensioningWorking DrawingsScaled DrawingsPractice WorksheetsWorking DrawingsThe final stage of illustrating yoursolution is to prepare a set oftechnical illustrations calledWorking set of drawings contains allthe information needed to buildthe product. Orthographic DrawingsUsed to show details of the front, top and right side viewsUses 3 viewsUsed to provide dimensions and special shapes by using different line types. For example object, hidden, and center the front first, top second, and right side lastSpace the views out equally at 40 mmA miter line is used to project details of the object from the topview to the right side view without measuring.

2 Drawnat 45 DrawingsThree dimensional (3d)You can see how all three views fit togetherAll horizontal lines are angled at 30 degreesand vertical lines remain verticalHidden lines and dimensioning are not shownon Isometric drawingsOrthographic and IsometricMULTIVIEW PROJECTIONT hree principle dimensionsof an object .. can be presented onlytwo in each view(s)is needed tofulfill the the object with respect to OBTAIN MULTIVIEW REPRESENTATION OF AN observermoves around THE OBJECTF ront viewRight side viewTop viewOBSERVER MOVE AROUNDF ront viewRight side viewTop viewTHE GLASS BOX CONCEPTB ottom viewLeft side viewRear viewHeightWidthDepthHistoryOrthographic Projectionof Object FeaturesOBJECT FEATURESE dgesare lines that represent the boundarybetween two faces. CornersRepresent the intersection of two ormore edgeNo cornerNo cornerSurfacesare areas that are bounded by edgesor limiting a line that represents the last visiblepart of the curve FEATURESABAFBFBRARATBTBRARAFBFATBTTrue lengthNORMAL LINETrue lengthPointEquallengthPROJECTION OF LINEABAFBFBRARATBTINCLINED LINEF oreshortenedBRARAFBFF oreshortenedATBTTrue lengthAEquallengthPROJECTION OF LINEABAFBFBRARATBTOBLIQUED LINEAE quallengthBForeshortenedForeshortenedFor eshortenedBRARAFBFATBTPROJECTION OF LINEBCAPROJECTION OF PLANEBFAF,CFCRAR,BRATCTNORMAL PLANEE quallengthEdgeEdgeTrue sizeCRAR,BRAF,CFBFATBTCTBTBCBFAFCRAR,BRA TCTINCLINED PLANEAE quallengthBTCCFEdgeCRAR.

3 BRForeshortenedBTCTATAFCFF oreshortenedBFPROJECTION OF PLANEPROJECTION OF OBJECTThe views are obtained by projecting all object features to the picture have to project the remaining surfaces which areinvisible too !sssPROJECTION OF OBJECTPROJECTION OF OBJECTPROJECTION OF TOP VIEWPROJECTION OF TOP VIEWPROJECTION OF TOP VIEWPROJECTION OF TOP VIEWPROJECTION OF TOP VIEWPROJECTION OF TOP VIEWPROJECTION OF TOP VIEWPROJECTION OF TOP VIEWPROJECTION OF FRONT VIEWPROJECTION OF FRONT VIEWPROJECTION OF FRONT VIEWPROJECTION OF FRONT VIEWPROJECTION OF FRONT VIEWPROJECTION OF FRONT VIEWPROJECTION OF FRONT VIEWPROJECTION OF FRONT VIEWPROJECTION OF FRONT VIEWPROJECTION OF RIGHT VIEWPROJECTION OF RIGHT VIEWPROJECTION OF RIGHT VIEWPROJECTION OF RIGHT VIEWPROJECTION OF RIGHT VIEWPROJECTION OF RIGHT VIEWLine Convention The meaning of linesLINE CONVENTIONP recedence of coincide linesHidden line drawingCenter line drawingThe meaning of linesTHE MEANING OF LINESO bject LinesTHE MEANING OF LINESH idden LinesTHE MEANING OF LINESC enter

4 LinesThin lines made upTHE MEANING OF LINESD imension LinesTHE MEANING OF LINESE xtension LinesPRECEDENCE OF LINEV isiblelineOrder ofimportanceHiddenlineCenterlineOTHER ARCHITECTURAL LINESH idden LinesARCHITECTURAL LINESO ther LinesOBJECT and HIDDEN line EXAMPLEOBJECT, HIDDEN and CENTER line EXAMPLEDraw front view firstOBJECT, HIDDEN and CENTER line EXAMPLEDraw top view secondOBJECT, HIDDEN and CENTER line EXAMPLEDraw right side view lastHIDDEN line PRACTICEH idden line should join a visible line , exceptitextended from the visible !JoinLeavespaceCorrectNo !Hidden line should join a visible line , exceptitextended from the visible line PRACTICEH idden line should intersect to form Land !LTHIDDEN line PRACTICEH idden arcs should start on a center line PRACTICEHIDDEN line PRACTICEHIDDEN line PRACTICEHIDDEN line PRACTICEHIDDEN line PRACTICEHIDDEN line PRACTICEHIDDEN line PRACTICEHIDDEN line PRACTICEHIDDEN line PRACTICECENTER line PRACTICEIn circular view, short dash should cross at the intersections of center line .

5 For small hole, center line is presented as thin continuous line should not extend between spaceLeave spaceLeave the gap when centerline forms a continuation with a visible or hidden lineLeavespaceLeavespaceLeavespaceLeaves paceCenter line should always start and end withlong line PRACTICEDRAWING USING A MITER LINEDRAWING USING A MITER LINEDRAWING USING A MITER LINESCALED DRAWINGSO bjects must be scaled to fit onto a piece of Drawing paperThey are exact in every detail but reduced or enlarged in size in direct proportion to the actual objectScale 1:11 mm on Drawing paper = represents 1mm of the actual objectSCALED DRAWINGSD ivide /Many objects are too large to be drawn to their full size. For example an airplane and DRAWINGSD etails of small objects are clearer and easier to dimension when they are drawn larger then their actual sizeMultiplyXOften it is necessary to produce drawings larger than full sizeTITLE BLOCKA title block is a portion of a Drawing that is set aside to give important information about the Drawing .

6 The drafter, the scale, the units, and your nameYou must frame your Drawing to make it look professional. Draw a 1 cm border and a 1 cm high area for your title blockA title block template can be found on the shared drive. Ask your teacher. TITLE BLOCK TEMPLATEDIMENSIONING DRAWINGSDIMENSIONING DRAWINGSDIMENSIONING DRAWINGSAsk your teacher for a list of dimensioning RulesDimensioning lines must follow these rulesTHE stage IS SET FOR YOU TO BECOME AN EXPERT TECHNICAL DRAWERP ractice Drawing worksheets can be found on the shared driv