engineering drawing - geometric construction, orthographic and isometric projection
DESCRIPTION
This presentation is used as my teaching material in Universitas Marsekal Suryadarma, Indonesia in 2013. There are some following chapters contain more of basic engineering drawing theory. Content of this presentations are refer to the reference page, and if anyone find that some contain in my presentation require premission from the relevant, please do not hesitate to contact me. Thanks and enjoy!!TRANSCRIPT
121 1208Engineering Drawing I
Carry Prameswari
Program Studi Teknik PenerbanganFakultas Teknologi Kedirgantaraan
Universitas Dirgantara Marsekal Suryadarma
Topics
• Geometric Construction• Orthographic Projection• Isometric Projection
Geometric Construction
Geometric Construction
• Construction of primitive geometric forms (points, lines and planes etc.) that serve as the building blocks for more complicated geometric shapes.
Geometric Constructiona. Point :
- Non dimensional geometrical element. - Occurred by interception of various lines.
Geometric Constructionb. Line : One dimension geometrical element occurred by moving of a point in various direction.
Geometric Constructionc. Plane: - Occurred by at least
three points or connection of one point and one line.
- A plane is always 2D- When the number of
element forming a plane increases, shape and name will change.
Geometric Construction
Relationship of One Line to Another Line or Arc
Bisecting a Line
Dividing a Line into Equal Parts
Orthographic Projection
Orthographic Projection• Reference:
Technical Graphics
• Advantage—Represent features of an object more accurately
• Example problem
Orthographic Projection
• Orthographic projections are a collection of 2D drawings that work together to give an accurate overall representation of an object.
Orthographic Projection
Projection Drawing
• Isometric projection is a method for visually representing three-dimensional objects in two dimensions in technical and engineering drawing.
Multi-view Projection—The Glass Box• Placing parallel planes to the
principal planes forms a glass box (always observed from outside the box)
• To show views of a 3D object on 2D piece of paper, it is necessary to unfold the planes such that they lie in the same plane
• All planes except the rear plane are hinged to the frontal plane, which is hinge to the left-side plane.
Multi-view Projection—The Glass Box
• By unfolding the box, six views of the object are possible
Multi-view Projection—The Glass Box
Multi-view Projection—The Glass Box
Multi-view Projection—The Glass Box
Multi-view Projection—The Glass Box
Multi-view Projection—The Glass Box
Multi-view Projection—The Glass Box
Which Views to Present?
Which Views to Present?
• General guidelines– Pick a Front View that contain the most
information that describe the object– Normally the longest dimension is chosen as the
width (or depth)– Most common combination of views are:• Front, top and side view
– Any other view that is different from the principal views is called an Auxiliary View
Minimum Drawing View
• 3 view• 2 view
Projection Angle
Projection Angle
Projection Symbol
First Angle European
Third Angle American
Projection Angle
Exercises
Exercises
Exercises
Exercises
Exercises
Exercises
QUESTION ???
Thank You