Ecor Review.doc

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Carleton University
Engineering Common Core Courses
ECOR 1010

Ecor ReviewEngineering graphics has evolved into six major areasTechnical IllustrationDescriptive GeometryEngineering Computer GraphicsNomographyGraphical MathematicsEmpirical EquationsEngineers convey information in three main waysWritten DocumentsOral PresentationsGraphicallySometimes a combination is neededTechnical IllustrationAlso called pictorial drawings technical illustrations are used to describe products in catalogues user and maintenance manualsThree common types1Perspective2Oblique3Isometric AxonometricPerspectiveOnePoint PerspectiveThe projection plane is parallel to two principal axes Receding lines along one of the principal axis converge to a vanishing pointTwoPoint PerspectiveIf the projection plane is parallel to one of the principal axes or if the projection plane intersects exactly two principal axes a twopoint perspective projection occursThreePoint PerspectiveIf the projection plane is not parallel to any principal axis a threepoint projection occurs with the visual rays converging to three vanishing points Oblique ProjectionFront face of object is parallel to the viewer therefore that face is true sizeUsed to give an indication of depthIsometric ProjectionParallel lines remain parallel instead of converging to a vanishing pointAxis are 120 degrees apartSpecial case of Axonometric projectionIsometric projection uses parallel projectors orthogonal projection but it shows more than one face of the object The x y and zaxes have the same metric The projected cube is also symmetric All sides are rhombuses a rhombus is a parallelogram with sides that are equal in length Orthographic ProjectionSnapshot of the top front and side viewOrthographicUseful when technical information is neededThey enable parts to be madeOften an isometric view is included with the standard viewsGraphicsComputer graphics with CAD and 3D ModelingNomographsA NOMOGRAPH also called an ALIGNMENT CHART is a calculating chart with scales that contain values of three or more mathematical variablesGraphical Mathematics Graphical MathematicsSolving algebraic equations using graphical techniques without projection Empirical EquationsModeling relations between empirical data as algebraic equationsExample algebraic equation to describe how different parts of a robot heat up from ambient conditions during the course of performing a continuous cyclic taskLine TypesObject Lines indicate all visible edges of an object They should stand out so the shape of an object is apparent to the eyeHidden Lines shows object lines that are hidden from viewCutting Plane Lines indicates edge view of an imaginary cutting planeCentre Lines indicates centres of holes and symmetrical featuresObject line Hidden Line Cutting plane Center line
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