ert 249 computer aided design (cad) for biosystem engineering
DESCRIPTION
Learning Outcomes APPLY geometric construction techniques to create engineering drawings using CAD. CREATE completes 2-D and 3-D drawings pertaining to geometric transformations, projections and multiple views. CREATE curve, surfaces and geometric modelsTRANSCRIPT
ERT 249ERT 249CComputer Aided Design omputer Aided Design
(CAD)(CAD)For Biosystem For Biosystem EngineeringEngineering
Prepared By:Prepared By:Samera binti Samsuddin SahSamera binti Samsuddin Sah
Email: [email protected]: [email protected]: 04-9798835/013-Phone: 04-9798835/013-
70045377004537
Learning OutcomesLearning Outcomes
Assessment and GradingAssessment and Grading
IntroductionIntroduction
Engineering DrawingEngineering Drawing
Computer Aided Design Computer Aided Design (CAD)(CAD)
Computer Aided DesignComputer Aided DesignComputer software
Geometric Modelling
CADTools in design
process
The integration of computer software and geometric model to serve the design process
Design ProcessDesign Process
Contribution of CAD in Contribution of CAD in designdesign
HistoryHistory
Evolution of CADEvolution of CAD
Design FormatsDesign Formats
3D Geometric Primitives3D Geometric Primitives
CAD Software ProductCAD Software Product
Advantages of CADAdvantages of CAD1.
2.
3.
4.
Advantages of CAD
CAD CapabilityCAD Capability
Limitation of CADLimitation of CAD(within scope of drawing creation)(within scope of drawing creation)
Limitation of CADLimitation of CAD(within scope of drawing (within scope of drawing
creation)creation)
Limitation of CADLimitation of CAD(within scope of drawing (within scope of drawing
interpretation)interpretation)
Basic Information Basic Information Included in a DrawingIncluded in a Drawing
Projected ViewsProjected Views
A Table ExampleA Table Example
DimensionsDimensions
A Dimensioning ExampleA Dimensioning Example
More basic informationMore basic information
ISO International Standards Organization
Standard CodeStandard Code
ANSI American National Standard InstituteUSA
JIS Japanese Industrial StandardJapan
BS British StandardUK
AS Australian StandardAustralia
Deutsches Institut für NormungDINGermany
Country Code Full name
มอก. สำ�นักง�นม�ตรฐ�นผลิตภัณฑ์อุตส�หกรรมThailand
Basic Line Types Basic Line Types
Types of Lines Appearance Name accordingto application
Continuous thick line Visible line
Continuous thin line Dimension lineExtension lineLeader line
Dash thick line Hidden line
Chain thin line Center line
Visible linesVisible lines represent features that can be seen in the
current view
Meaning of LinesMeaning of Lines
Hidden linesHidden lines represent features that can not be seen in the current view
Center lineCenter line represents symmetry, path of motion, centers of circles, axis of axisymmetrical parts
Dimension and Extension linesDimension and Extension lines indicate the sizes and location of features on a drawing
ExampleExample : : Line conventions in engineering drawingLine conventions in engineering drawing
Line ConventionLine Convention
Precedence of coincide lines.
Hidden line drawing.
Center line drawing.
Precedence of LinePrecedence of Line
Visibleline
Order ofimportance
Hiddenline
Centerline
Hidden Line PracticeHidden Line Practice
Hidden line should join a visible line, except itextended from the visible line.
Correct
No !
Join
Leavespace
Correct No !
Hidden line should join a visible line, except itextended from the visible line.
Leavespace
Leavespace
Hidden Line PracticeHidden Line Practice
Hidden line should intersect to form L and Tcorners.
Correct
No !
L T
Hidden Line PracticeHidden Line Practice
Hidden arcs should start on a center line.
Hidden Line PracticeHidden Line Practice
Centre Line PracticeCentre Line PracticeIn circular view, short dash should cross at the intersections of center line. For small hole, center line is presented as thin continuous line.
Center line should not extend between views.
Leave space Leave space
Leave the gap when centerline forms a continuation with a visible or hidden line
Leavespace
Leavespace
Leavespace
Leavespace
Center line should always start and end withlong dash.
Centre Line PracticeCentre Line Practice
ScalingScaling
Drawing SheetDrawing Sheet
•Trimmed paper of a size A0 ~ A4.
•Standard sheet size (JIS)
A4 210 x 297A3 297 x 420A2 420 x 594A1 594 x 841A0 841 x 1189
A4
A3
A2
A1
A0
(Dimensions in millimeters)
Drawing space Drawingspace
Title block
d
d
c
c
cBorder lines
1. Type X (A0~A4) 2. Type Y (A4 only)
Orientation of drawing sheetOrientation of drawing sheet
Title block
Sheet size c (mm) d (mm) A4 10 25 A3 10 25 A2 10 25 A1 20 25 A0 20 25
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