# U2 Sketching Multi-View Drawings

Multiview Sketching Introduction to Engineering Design 2012 Project Lead The Way, Inc. 2D view of a 3D shape There are always six principal 2D views of a 3D object

Front, back, top, bottom, left and right Left view Multiview Drawings (Orthographic Drawings or Orthographic Projection Drawings) Shows two or more two-dimensional views of a three-dimensional object.

Provides 2D shape drawing of an object. When combined other with dimensions, the drawings serve as the main form of communication between designers and manufacturers. Blueprints Ortho means straight; rectangular; upright. The six principal views of orthographic Projection

drawings (Multiview drawings or orthographic drawing) The six principal views of orthographic Projection drawings (Multiview drawings) or orthographic drawing Orthographic Projection Orthographic Projection is the easiest technique used to create multiview drawings.

Orthographic Projection is the projection of the features of an object onto an imaginary plane. Plane is a flat surface that goes on forever but has no depth The projection of the features from the object to the plane is made by lines of sight that are perpendicular to the imaginary plane. Perpendicular meets at 90 degree angles

Orthographic Projection (Glass Box Method) The best way to understand orthographic projection (glass box method) is to imagine an

object contained inside a glass box. Orthographic Projection (Glass Box Method) There is a total of six glass walls

surrounding the object. Each wall represents a projection plane onto which a twodimensional object view will be created. Projection Plane Also referred to as a plane of projection

or picture plane, is an imaginary surface that exists between the viewer and the object. The projection plane is the surface onto which a two-dimensional view of a threedimensional object is projected and created. Orthographic Projection Start by focusing

only on the front projection plane. A person standing in front of the object would see only the five corners identified in black. 2

3 1 ht g i f s ngle o e

lin 90 a ction at proje to ne pla 4 5 Orthographic Projection

Projection lines are used to project each corner outward until they reach the projection plane. Projection Line An imaginary line that is used to locate or

project the corners, edges, and features of a three-dimensional object onto an imaginary two-dimensional surface. Orthographic Projection The visible edges of the object are then identified on the projection

plane by connecting the projected corners with object lines. Orthographic View Selection Recommendations for how to select the front view Most natural position or use

Shows best shape and characteristic contours Longest dimensions Fewest hidden lines Most stable and natural position Orthographic View Selection Best shape description

BE ST FR O NT

No hidden edges VI EW Most natural position Longest dimension Orthographic Projection Visually

Explained http://faculty.gvsu.edu/karpenm/melissa/glas sboxindex.html STOP HERE Multiview Drawing All three-dimensional objects have width,

height, and depth. Width is associated with an objects side-toside dimension. Height is associated with an objects top-tobottom dimension. Depth is associated with an objects front-toback dimension. Multiview Drawing TOP VIEW

FRONT VIEW RIGHT-SIDE VIEW Multiview Drawing 45

Sketching a Multiview Drawing Given the overall dimensions of the object, a pencil, and a sheet of graph paper, sketching a multiview drawing can be easily done using points, construction lines, and object lines. Sketching a Multiview Drawing Step 1 Layout the boxes within which the individual views will occur using points

and construction lines. TOP FRONT RIGHT SIDE Sketching a Multiview Drawing

Step 2 Use construction lines between the views to indicate the geometry of the views. Sketching a Multiview Drawing Step 3 Identify the visible edges with object lines.

Sketching a Multiview Drawing Step 4 Locate hidden lines. STOP Orthographic Projection

Orthographic projection drawing have six principal view. But in most case three or less are needed. Number of views needed Orthographic Projection 6 views are rarely needed. Want the least views necessary to show the details of the object

Want the least views necessary to dimension the drawing Dont dimension to hidden lines, in that case add another view. The less views the better but if you really need another view to get a good feel of what the object is you can All six views are not always needed

LEFT SIDE FRONT Dining Chair RIGHT SIDE

A cylinder only really needs one view. But it can be done with two. 5.0 4.0 4.0

5.0 One view Two view Number of Orthographic Projections One View is needed

Some cylindrical shapes Uniform thickness or shape two views would be identical All dimensions properly and easily shown on one

view depth Number of Orthographic Projections Two Views Symmetrical part Second view is necessary for depth since all depth is not constant A third view would be identical to

another one All detail and dimensions fit on two 2 views are minimum but three show the details are better 3 views are needed Historical example: Leonard P. Karr (19131995)

What is this object? Do you think Mr. Karr aligned his drawing correctly? A Question Each of the blocks at the right has the

same overall dimensions and color. What else do they have in common? A Question They all have identical top

views!

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