Transcript Engineering Drawing ME 250

Engineering Drawing
ME 250: Design & Manufacturing I
School of Mechanical Engineering
Shanghai Jiao Tong University
1
Course Outline


Descriptive Geometry
Engineering Drawing





Orthographic views
Auxiliary views
Section views
Dimensions
Working drawing
Shanghai Jiao Tong University
2
Engineering Drawing

Why should we use and learn about
Engineering Drawing?

Maybe the geometry information can be
expressed in 3D module by Unigraphics,
but how to express the information else
such as the notes, title,……?
Shanghai Jiao Tong University
3
Multi-view Drawing



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.
Shanghai Jiao Tong University
4
Orthographic Views

Orthographic Views is the basic part in an
Engineering Drawing.
Shanghai Jiao Tong University
5
Orthographic Views
Shanghai Jiao Tong University
6
Orthographic Views
Shanghai Jiao Tong University
7
Exercise in Class (1)

Neatly sketch the six orthographic views for the
object. Do not dimensioning the drawing but
maintain scale.
Shanghai Jiao Tong University
8
Exercise in Class (1)
Shanghai Jiao Tong University
9
Exercise in Class (2)

Complete the multi-view drawing by
adding the missing view.
Shanghai Jiao Tong University
10
Exercise in Class (3)
Shanghai Jiao Tong University
11
Exercise in Class (4)
Shanghai Jiao Tong University
12
Axonometric Views


The general term axonometric drawing is
used within the technical drawing field.
The types of axonometric drawings:



Isometric
Dimetric
Trimetric
Shanghai Jiao Tong University
13
Isometric Drawing

Three visible normal surfaces have equal
o
angles between them (120 )
Shanghai Jiao Tong University
14
Dimetric Drawing

Two of the three visible normal surfaces
o
have equal angles, not equal to 120 .
Shanghai Jiao Tong University
15
Trimetric Drawing

None of the angles between the three visible
normal surfaces are equal.
Shanghai Jiao Tong University
16
Isometric Sketching

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.
Shanghai Jiao Tong University
17
Isometric Sketching



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.
Shanghai Jiao Tong University
18
Exercise in Class (5)
Shanghai Jiao Tong University
19
Exercise in Class (5)
Shanghai Jiao Tong University
20
Exercise in Class (6)
Shanghai Jiao Tong University
21
Auxiliary Views
Shanghai Jiao Tong University
22
Auxiliary Views
Shanghai Jiao Tong University
23
Exercise in Class (7)
Shanghai Jiao Tong University
24
Line Styles
Shanghai Jiao Tong University
25
Symbols for Section Lining
Shanghai Jiao Tong University
26
Symbols for Section Lining
Shanghai Jiao Tong University
27
Section Views
Shanghai Jiao Tong University
28
Section Views
Shanghai Jiao Tong University
29
Section Views
Shanghai Jiao Tong University
30
Section Views
Shanghai Jiao Tong University
31
Exercise in Class (8)
Shanghai Jiao Tong University
32
Exercise in Class (9)
Shanghai Jiao Tong University
33
Review



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.
Shanghai Jiao Tong University
34