lecture 1 for ed
TRANSCRIPT
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Introduction to engineering drawing
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• List of Drawing Instruments and Materials
• Instruments box containing the following minimum items:
• A large compass (150 mm)
• A bow compass with adjusting screws (100 mm)
• A large divider
• A bow divider with adjusting screws (100 mm)
• A good quality drafter
• A pair of set squares: 45°-45°, 30°-60° (250 mm, 2.5 mm thick)
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Conventional lines
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Type of views
• Isometric
• Orthographic
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Chapter 5
Orthographic
Projection
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OBSERVER MOVE AROUND
Front view Right side view
Top view
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THE GLASS BOX CONCEPT
Bottom view
Left side view
Rear view
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Height
Width
De
pth
History
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PROJECTION SYSTEMS1. First angle system
2. Third angle system
First Quadrant
ThirdQuadrant
- European country
- ISO standard
- Canada, USA,
Japan, Thailand
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ORTHOGRAPHIC PROJECTION
1st angle system 3rd angle system
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ORTHOGRAPHIC VIEWS
1st angle system 3rd angle system
Foldingline
Foldingline
Foldingline
Foldingline
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ORTHOGRAPHIC VIEWS
1st angle system 3rd angle system
Front View
Front View
Right Side View
Right Side View
Top View
Top View
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First angle system Third angle system
PROJECTION SYMBOLS
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PROJECTION SYMBOLS
d 1.7d
2.2d
Suggested proportion
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Orthographic Writing Steps
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WRITING STEPS
1. Select the necessary views
2. Layout the views.
3. Project the views.
4. Dimension the views.
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1. SELECT THE NECESSARY VIEWS
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45
152
152
64
2. LAYOUT THE VIEWS
A4
25
Choose anappropriate scale
1:1
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PROJECT THE VIEWS
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DIMENSION THE VIEWS
NOTES1. Dimensions in millimeters.2. ….
PART NAME
xx
x x
y
y
y
y
z
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TRANSFERINGTHE DEPTH DIMENSION
1. Direct measurement
01
23
27
0 1 2 3 Starting point27
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TRANSFERINGTHE DEPTH DIMENSION
2. Use miter line
45
Views too close
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No line is formed when curved surface tangent
to a plane surface.
No line
No line
TANGENT & INTERSECTION
Line is formed when curved surface intersects
a plane surface.
tangent
tangent
intersect
intersect
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Orthographic
Projection
of Object Features
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OBJECT FEATURES
Edges are lines that represent the boundary
between two faces.
Corners Represent the intersection of two or
more edges.
Edge
Corner
Edge No edge
No corner No corner
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Surfaces are areas that are bounded by edges
or limiting element.
Limitingelem
ent
is a line that represents the last visible
part of the curve surface.
Surface Surface Surface
LimitLimit
OBJECT FEATURES
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Line Convention
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HIDDEN LINE PRACTICE
Hidden line should join a visible line, except itextended from the visible line.
Correct
No !
Join
Leavespace
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Correct No !
Hidden line should join a visible line, except itextended from the visible line.
Leavespace
Leavespace
HIDDEN LINE PRACTICE
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Hidden line should intersect to form L and Tcorners.
Correct
No !
L T
HIDDEN LINE PRACTICE
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Hidden arcs should start on a center line.
HIDDEN LINE PRACTICE
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Introduction to AutoCAD
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OUTLINE
• Giving commands
• Object snap
• Zooming and panning
• Drawing 2D shapes
• Drawing 3D shapes
• Editing
• UCS
• Assignment
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How do we give a command?
• Command line
• Toolbars(view/Toolbars)
• Drop-down menus
You can pick any one(s) that you are comfortable with.
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What is OSNAP?• Osnap (Object Snap) settings make it easier to select a 2d
object’s points– Endpoint
– Midpoint
– Perpendicular
– Center
– İntersection
• Osnap will be active when
AutoCAD is expecting you to
pick a point on the working area
• Type osnap on your
command window:
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Zooming...• You will need to zoom in and out while drawing with
AutoCAD. This doesnt change your objects or UCS, only the way you see your working space. This can be done in many ways:
1. Scroll bars
2. Typing z or zoom in your command window.
• All
• Center
• Dynamic
• Extents
• Previous
• Scale
• Window
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Lets draw a LINE:• remember that AutoCAD recognizes an object by its
coordinates. You will need two given points to draw a line.
• You can start at a random point on your WCS for your FIRST POINT, but you should specify the coordinates of your SECOND POINT.
(x1,y1,z1)
(x2,y2,z2)
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What else?• Rectangle: two diagonal lines
(pick first point, select the second one with relation to the first. @5<-33)
• Circle/Arc: center and radius
• Polygon: specify the number of edges and length of a side
A small tip: you can use the EXPLODE command for the tool to split the object into its components or lines
a
b
a
d
d
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Editing… • COPY
• MOVE
• MIRROR
ARRAY
SCALE
STRETCH
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More editing…• STRETCH
• EXPLODE
OFFSET
ROTATE
ERASE
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Polyline (pline) • The PLINE command creates a chain line with
multiple vertexes and straight or circular segments between the vertexes
• Draw a closed shape with the pline command:
• Then type PEDIT (polyline edit) on the command line and see what you can do with it:Enter an option [Close/Join/Width/Edit vertex/Fit/Spline/Decurve/Ltype gen/Undo]:
Try Width and Spline
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Hatching
• Hatching is used to add shaded patterns to objects and shapes within an Autocad drawing. Hatch patterns can be used to indicate a material to be used, such as a concrete hatch. Alternatively it could be used to make an area of a drawing stand out.
• You will pick:
– Pattern
– Scale
– Angle
– points
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• Solids contain the “mass properties” of 3D objects.
• You can use the Solids toolbar for readily accessible objects
– Box
– Cylinder
– Wedge
• You can use the Boolean operations of more complicated shapes.
– Union (join two solids)
– Subtract (carve out the second solid from the first)
– Intersection (only the common area)
Drawing SOLIDS
Torus
Cone
Sphere
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We can create solids by extruding as well
• If you “extrude” a surface into the third dimension, you simply add a thickness in section. This basically is same as creating a “solid” object
Extrude 5 units 5 units
Extrude -4 units
4 units