Different Views Of An Object - Cvut.cz

20.10.2016Different views of an objectObjects may be drawn in different waysMultiviewPictorial Better for showing true sizeand shape Better for visualizing theobject Each view only shows twodimensions All three dimensionsshown on a single viewMultiview DrawingA multiview drawing is one that shows two or more 2Dviews of a 3D object.1

20.10.2016Multiview Drawing Orthographic projectionMultiview drawings provide the shapedescription of an object.When combined with dimensions,Objectmultiview drawings serve as the mainProjection planeform of communication betweendesigners and manufacturers.Line of sightAbility to see clearly in the mind’s eyean objectPuzzle over multiple viewsMultiview drawings serve as the documentation for manufacturers– designers must NOT draw puzzle– views should be visually balanced2

20.10.2016Placement of ViewsViews should be visually balancedwithin the working spaceParallel orthogonal projection onto two mutually orthogonalplanes – horizontal plane π and vertical (frontal) plane hTxtJd3

20.10.2016Angles of ProjectionFirst/third-angle projection– Used by many European countries/Standard for the United States– Object is projected onto planes from the first/third angle or quadrant.First angleThird angleChoosing Views Complex objects require three views todescribe its shape Simple objects can be described withtwo views– Ex: Soda Can Thin objects can be described withonly one view– Depth is given in a note– Ex: Erasing Shield4

20.10.2016Straight Edges Edges that are parallel to a plane of projection appearas segment with true size. Edges that are inclined to a plane of projection appearas foreshortened linesCurved Edges Curved edges project as straight lines on the plane towhich they are perpendicular Curved edges project as curved lines on the planes towhich they are parallel or inclined5

20.10.2016Normal SurfacesNormal surfaces appear as an edge in two oppositeprincipal views, and appear a surface in all otherprincipal views.Inclined SurfacesInclined surfaces appear as an edge in two oppositeprincipal views, and appear foreshortened (not true size) inall other principal views.6

20.10.2016Oblique SurfacesOblique surfaces do not appear either as an edge or truesize in any principal view.Intersections & TangenciesWhere a curved surface is tangent to a plane surface, no lineshould be shown where they join.7

20.10.2016Intersections & TangenciesWhere a plane surface intersects a curved surface, anedge is formed.A Question Each of the blocksto the right have thesame overalldimensions andcolors.What else to theyhave in common?8

20.10.2016Answer .They all have identicaltop views!HIDDEN LINESMUTLIVIEW DRAWINGSWe place hidden linesin a drawing to do thefollowing things:1. Show hidden features2. Clarify the positionand shape of features3. Make the “plate” morereadable(NOTE: The term“plate” refers to afinished drawing.)9

20.10.2016How many views?Cubes (like these dice) have 6 sidesSince each side of the diewill have its own view then there must be SIXpossible orthographic views!FrontHow many views?Cubes (like these dice) have 6 sidesSince each side of the diewill have its own view then there must be SIXpossible orthographic views!FrontTop10

20.10.2016How many views?Cubes (like these dice) have 6 sidesSince each side of the diewill have its own view then there must be SIXpossible orthographic views!The Front, Top, and RightSide are the views that areusually drawn.FrontBackTopBottomRight SideLeft SideWhere do the views go?All the views MUST be arranged correctlyImagine “unfolding” the cubeto get proper view alignment.The back view can be placedin any of these four locations.11

20.10.2016Layout of the 6 ViewsSketch the layout of the 6 views of this object and label the views.TOPREARL. SIDEFRONTR. 10/drafting/multi/12

20.10.2016The Globe A geographic coordinate system enables everylocation on the Earth to be specified by latitude,longitude and elevation. The "latitude" of a point on the Earth's surface isthe angle between the equatorial plane and thestraight line that passes through that point andthrough the center of the Earth. Lines joining points of the same latitude tracecircles on the surface of the Earth called parallels,as they are parallel to the equator and to eachother. The "longitude" λ of a point on the Earth'ssurface is the angle east or west from a referencemeridian to another meridian that passesthrough that /SGYnT9Ke13

20.10.2016Helix – trajectory in the screw motionThe helix is given by generating pointM, axis o π and high v of one terial/ePbnZDAZHelix – trajectory in the screw motionThe helix is given by generating pointM, axis o π and high v of one screwthread.14

Multiview drawings provide the shape description of an object. When combined with dimensions, multiview drawings serve as the main form of communication between designers and manufacturers. Ability to see clearly in the mind’s eye an object Line of sight Projection plane Object