dr. kevin wong industrial centre introduction to autocad engineering drawings
TRANSCRIPT
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Dr. Kevin WongIndustrial Centre
Introduction to AutoCAD Engineering Drawings
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Learning Outcomes
• Upon completion of the workshop, students should be able to:
a) Explain the principle and conventional representation of engineering drawings according to engineering standards,
b) Apply the features and functions of typical CAD systems for producing CAD drawings,
c) Communicate through CAD drawings.
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Manual Drawing Vs CAD
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Introduction to CAD Computer Aided Drafting/Design
• Basic skills for nowadays’ Engineer• Communication media among different discipline of people in different
place• Can be simply classify into 2 types of CAD system – 2D and 3D• Some advantages of using CAD
– Accuracy • An accuracy of up to 14 decimal places
– Speed• Revising and editing drawings can be done quickly with minimum
effort• Reuse of drawing content can be done easily
– 3D Representation and Analysis• Interference checking and 3D animations can be easily performed
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Introduction to CAD
Get a Trial Version (30-days)http://usa.autodesk.com/autocad/trial/
• AutoCAD• One of the most well-known 2D CAD software
developed by Autodesk• Widely be used to output construction drawings for
civil engineering, architecture, and building services• Other applications include electrical PCB design,
garment design and facility management
AutoCAD2015 Free Trial
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Engineering Drawing Created by AutoCAD
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Architecture Drawing Created by AutoCAD
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Starting AutoCAD
Start up > Autodesk > AutoCAD Mechanical 2015 > AutoCAD 2015
Auto CAD 2015
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User Interface (AutoCAD classic)
Current File NameMenu Bar
Toolbar
(Icon)
Layers
X, y, z coordinate system
Draw Toolbar
Status Bar
User Coordinate System (UCS)
Graphic
cursor
Drawing Area(Graphic Window)
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AutoCAD User Interface
TabsClick here to expand panel
Tooltip
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AutoCAD User InterfaceDynamic Input• The key allows you to toggle between the different input field• The key allows you to display a list of valid command options
Length Dimension
Cursor
Current Input Field
Dynamic Prompt
Angle Dimension
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Mouse Interface
Left button Click the specific points and select pull down menu or graphic icon(Selection)
Right buttonClick to activate the right click menu
Middle button Scroll to zoom in or zoom out
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Keyboard InterfaceEnterGo to next step of command / repeat last command
SpacebarGo to next step of command / repeat last command
DeleteTo erase lines or any sketches
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To Set Up a Drawing• Step 1: New a draw
Show the Menu barFile > New > OK
3
Menu Bar
1
2
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To Set Up a Drawing• Step 2: Define the drawing units
Format > Unit > Millimeters > OK
1
2
3
4
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• Step 3: Load the line typesFormat > Line Type > LoadCommon used linetype:- Continuous , Hidden, Center, Dashed
To Set Up a Drawing1
2
3
4
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• Step 4: Create layer for drawing controlFormat > Layer > New LayerNew – Create a new layerDelete – Delete a layerCurrent – Set the selected layer to be the active layerColor – Set layer’s colorLinetype – Select/Load linetype for a layerLineweight – Select the thickness of the line for a layer.
To Set Up a Drawing1
2
3
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AutoCAD User Interface• Draft Setting
- Turn on and off the options by clicking on the buttons in the status bar
Snap ModeGrid Display Ortho Mode
Polar TrackingObject Snap
Object Snap Tracking Allow/Disallow Dynamic UCS
Dynamic Input
Show/Hide Lineweight
Quick Properties
Off StatusOn Status
Remark:Status Bar
Infer Constraints
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Dwing Sheet
• Step 5: Define the drawing limitsFormat > Drawing Limits
To Set Up a Drawing1
2Specific lower left corner: E.g.: 0,0 Specific upper right corner: E.g.: 420, 297
420
297 Drawing Sheet
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• Line – By specify
• Co-ordinates (start & end point)
• Dynamic input (start point, distance & angle)
Command of line = l
• Rectangle- By specify
• Co-ordinates (first corner point & other corner point)
Command of rectangle = rec
Draw Command - Line & Rectangle• Line & Rectangle
0,0
@10,3
0,0
10
300,0
@10,3
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• Draw with Absolute Cartesian Coordinate 0,0 *4,0 *2,3 *0,0
+X
+Y
-XX=0, Y=0
1 2 3 4 5
-5 -4 -3 -2 -1 1
2
3
-2
-1
2,3
0,0 4,0
Absolute
• Draw with Absolute Polar Coordinate 0,0 * 4<180 *4<120 *0<120
X-coordinate Y-coordinate
180o
0,0
0,0
Absolute Distance Angle
120o
*4<180
*4<120
*0<120
Features of AutoCAD
+X, +Y
+X, -Y-X, -Y
-X, +Y
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• Draw with Relative Cartesian Coordinate -2,1 @5,0 @0,2 @-5,-2
+X
+Y
-XX=0, Y=0
1 2 3 4 5
-5 -4 -3 -2 -1 1
2
3
-2
-1
+X, +Y
+X, -Y-X, -Y
-X, +Y
Features of AutoCAD
@0,2
@5,0
Relative
• Draw with Relative Polar Coordinate 0,0 @ 5<0 @3<90 @5.83<211
X-coordinate Y-coordinate
-2,1
Relative Distance Angle
90o
@3<90
211o
@5<[email protected]<211
@-5,2
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Activity 1Write a list of relative coordinates used to draw the following figure
Cartesian0,0......
Polar0,0......
50
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Activity 1 - Solution
50
Cartesian0,0@50,0@0,10@-10,0@-30,40@0,10@-10,0@0,-60
Polar0,0@50<0@10<90@-10,0 (@10<180)@50<127@10<90@-10<0(@10<180)@60<270
Write a list of relative coordinates used to draw the following figure
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• View > Zoom > All• View > Zoom > Window• View > Zoom > In• View > Zoom > Out
Zoom
Zoom > All
Zoom > Window
Zoom > In
Zoom > Out
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• Circle – By specify
• Center point & radiusCommand of circle = c
• Ellipse- By specify
• Center point, first end point of axis with angle & distance of other axis
Command of ellipse = el
Draw Command – Circle & Ellipse• Circle & Ellipse
0,0
10@15<0o
0,0
10
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• Center, Star, End Arc – By specify
• Co-ordinates (center point, start point of the arc & end point of the arc)• Dynamic input (center point, radius with angle & end point of the arc)
Command of arc = a
Draw Command – Arc• Center, Star, End Arc
0,0@10<0o
500,0
@10<0o
135
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Modify Command – Copy & Move• Copy & Move
• CopyStep 1. Select object to copyStep 2. Select base pointStep 3. Specify the point to move
Command of copy = co/cp
• MoveStep 1. Select object to moveStep 2. Select base pointStep 3. Specify the point to move
Command of lengthen = mo
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Modify Command – Trim & Extend• Trim & Extend
• TrimStep 1. Select object to act as the
boundaryStep 2. Select object to trim
Command of trim = tr
• ExtendStep 1. Select object to act as the
boundaryStep 2. Select object to extend
(please noted that the location of the selected point define which side to extend)
Command of extend = ex
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Modify Command – Fillet & Chamfer• Fillet
• FilletStep 1. Type in “r” for radiusStep 2. Input the radius (e.g. 10)Step 3. Select the first edge & second edges to form the radius
Command of fillet = f
R10
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• Chamfer Length & AngleStep 1. Type in “d” for distanceStep 2. Input the first chamfer
distanceStep 3. Input the chamfer angle
from the first line. Step 4. Select the first & second
lines to form the chamferCommand of chamfer = cha
Modify Command –Chamfer• Chamfer
• Chamfer Two DistancesStep 1. Type in “d” for distanceStep 2. Input the first & second
chamfer distanceStep 3. Select the first & second
lines to form the chamferCommand of chamfer = cha
First d
Second d
First d
Angle
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Practical Exercise 1• Use the (50,50) be starting point
Staring Point
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Practical Exercise 2• Starting point B is (370,90) and use discretion for sizes not given
Staring Point