Download Engineering Drawing ME 250

Engineering Drawing
ME 250: Design & Manufacturing I
School of Mechanical Engineering
Shanghai Jiao Tong University
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Course Outline
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Descriptive Geometry
Engineering Drawing
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Orthographic views
Auxiliary views
Section views
Dimensions
Working drawing
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Engineering Drawing
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Why should we use and learn about
Engineering Drawing?
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Maybe the geometry information can be
expressed in 3D module by Unigraphics,
but how to express the information else
such as the notes, title,……?
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Multi-view Drawing
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Isometric views can be easily and quickly
understood. But maybe a number of graphical
features are not shown. This happens when a
given feature will overlay or partial cover
other features which we are trying to show or
explain.
Isometric views are suitable for representing
preliminary ideas or sketches.
In real Engineering Practice, Multi-view
Drawing is still very important.
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Orthographic Views
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Orthographic Views is the basic part in an
Engineering Drawing.
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Orthographic Views
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Orthographic Views
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Exercise in Class (1)
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Neatly sketch the six orthographic views for the
object. Do not dimensioning the drawing but
maintain scale.
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Exercise in Class (1)
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Exercise in Class (2)
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Complete the multi-view drawing by
adding the missing view.
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Exercise in Class (3)
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Exercise in Class (4)
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Axonometric Views
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The general term axonometric drawing is
used within the technical drawing field.
The types of axonometric drawings:
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Isometric
Dimetric
Trimetric
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Isometric Drawing
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Three visible normal surfaces have equal
o
angles between them (120 )
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Dimetric Drawing
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Two of the three visible normal surfaces
o
have equal angles, not equal to 120 .
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Trimetric Drawing
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None of the angles between the three visible
normal surfaces are equal.
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Isometric Sketching
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Isometric sketching starts with three isometric
axes. One of them is sketched vertically with
o
the other two at an estimated 30 to the
horizontal axis.
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Isometric Sketching
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Step 1: sketch an enclosing isometric box.
Step 2: on the surfaces of this box, draw the
orthographic views.
Step 3: complete each feature by projecting it
into the box.
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Exercise in Class (5)
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Exercise in Class (5)
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Exercise in Class (6)
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Auxiliary Views
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Auxiliary Views
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Exercise in Class (7)
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Line Styles
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Symbols for Section Lining
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Symbols for Section Lining
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Section Views
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Section Views
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Section Views
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Section Views
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Exercise in Class (8)
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Exercise in Class (9)
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Review
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Drawing is thinking
Descriptive geometry is useful for
solving advanced technical problems
involving the spatial relationships of
points, lines, planes and solid shapes.
Using the third-angle projection to
create the engineering drawing.
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