Shanghai Jiao Tong University 1 Engineering Drawing ME 250: Design & Manufacturing I School of Mechanical Engineering

Shanghai Jiao Tong University 2 Course Outline Descriptive Geometry Engineering Drawing Orthographic views Auxiliary views Section views Dimensions Working drawing

Shanghai Jiao Tong University 3 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 4 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 5 Orthographic Views Orthographic Views is the basic part in an Engineering Drawing.

Shanghai Jiao Tong University 6 Orthographic Views

Shanghai Jiao Tong University 7 Orthographic Views

Shanghai Jiao Tong University 8 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 9 Exercise in Class (1)

Shanghai Jiao Tong University 10 Exercise in Class (2) Complete the multi-view drawing by adding the missing view.

Shanghai Jiao Tong University 11 Exercise in Class (3)

Shanghai Jiao Tong University 12 Exercise in Class (4)

Shanghai Jiao Tong University 13 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 14 Isometric Drawing Three visible normal surfaces have equal angles between them (120 o )

Shanghai Jiao Tong University 15 Dimetric Drawing Two of the three visible normal surfaces have equal angles, not equal to 120 o.

Shanghai Jiao Tong University 16 Trimetric Drawing None of the angles between the three visible normal surfaces are equal.

Shanghai Jiao Tong University 17 Isometric Sketching Isometric sketching starts with three isometric axes. One of them is sketched vertically with the other two at an estimated 30 o to the horizontal axis.

Shanghai Jiao Tong University 18 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 19 Exercise in Class (5)

Shanghai Jiao Tong University 20 Exercise in Class (5)

Shanghai Jiao Tong University 21 Exercise in Class (6)

Shanghai Jiao Tong University 22 Auxiliary Views

Shanghai Jiao Tong University 23 Auxiliary Views

Shanghai Jiao Tong University 24 Exercise in Class (7)

Shanghai Jiao Tong University 25 Line Styles

Shanghai Jiao Tong University 26 Symbols for Section Lining

Shanghai Jiao Tong University 27 Symbols for Section Lining

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 Section Views

Shanghai Jiao Tong University 32 Exercise in Class (8)

Shanghai Jiao Tong University 33 Exercise in Class (9)

Shanghai Jiao Tong University 34 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