Orthographic Projection Question What is the name of the feature indicated? A. Countersink B. Counterbore C. Spotface D. Hole E. Stepped hole CAD/Fab Assemblies & Mobility 2 Question Product Features The Vocabulary of Design Download from web site What is the name of the feature indicated? A. Countersink B. Counterbore C. Spotface D. Hole E. Stepped hole CAD/Fab Assemblies & Mobility 3 CAD/Fab Orthographic Projection 4 1
Product Features (cont d) The Alphabet of Lines Line style communicates different information: Visible object line (heavier than others) Hidden line Section line Center line Implies Implies CAD/Fab Orthographic Projection 5 CAD/Fab Orthographic Projection 6 Orthographic Projection Imagine an object inside a glass box Parallel visual rays project from the object to the projection plane. CAD/Fab Orthographic Projection 7 CAD/Fab Orthographic Projection 8 2
The object s image is formed on the projection plane by the pierce points of the visual rays. Similarly, the top view is projected to the horizontal plane CAD/Fab Orthographic Projection 9 CAD/Fab Orthographic Projection 10 For many three-dimensional objects, two to three orthographic views are sufficient to describe their geometry. The box can be unfolded to show the multiple views in a single x-y plane CAD/Fab Orthographic Projection 11 CAD/Fab Orthographic Projection 12 3
Typical Three-View Placement The views are oriented orthogonally in relationship to each other. DEPTH TOP TOP WIDTH DEPTH Projection Lines HEIGHT FRONT RIGHT SIDE FRONT RIGHT SIDE CAD/Fab Orthographic Projection 13 CAD/Fab Orthographic Projection 14 The Glass Box Concept Top View View Selection Back View Right View Poor view orientation Left View Bottom View CAD/Fab Orthographic Projection 15 Good view orientation CAD/Fab Orthographic Projection 16 4
View Selection in SolidWorks One View May be Adequate Centerline indicates circular feature Think first about what makes most sense To change views in SolidWorks: 1.00 Φ Φ symbol means diameter Note: This does NOT change the original reference planes used to create the model! CAD/Fab Orthographic Projection 17 CAD/Fab Orthographic Projection 18 Two Views May be Adequate Workshop Sketch as many ways as you can to model a 2 diameter cylinder 3 tall in SolidWorks. CAD/Fab Orthographic Projection 19 CAD/Fab Assemblies & Mobility 20 5
Question Extrude a circle How many methods did you come up with? A) One B) Two C) Three D) Four E) Five or more CAD/Fab Orthographic Assemblies & Projection Mobility 21 Revolve a rectangle Extrude cut a square with a circular cutout 6
Revolve cut a cutout shape Sweep a circle along a straight line Loft two circles First-Angle Projection Be careful how you pick profiles! Viewing Station at Infinity Line of Sight Object Object is placed between the observer and viewing plane Projection Plane (Picture Plane Viewing Plane) CAD/Fab Orthographic Projection 28 7
First-Angle Projection The image of the front view is projected to the projection plane behind the object. The top (horizontal) view is projected from above the object but is created on the plane below. Front View Front View Horizontal or Top View Line of sight CAD/Fab Orthographic Projection 29 CAD/Fab Orthographic Projection 30 As with the previous two projections, the right side view is projected to the opposite side of the glass box. Profile or Right Side View The reference frame can be unfolded to show the multiple views in a single X-Y plane Profile or Right Side View Front View Horizontal or Top View In first-angle projection the box unfolds away from the observer rather than towards the observer Front View Horizontal or Top View CAD/Fab Orthographic Projection 31 CAD/Fab Orthographic Projection 32 8
Profile or Right Side View The reference frame can be unfolded to show the multiple views in a single X-Y plane Question The views are reversed in their order from third-angle projection; the top view is below the front view and the right side view is to the left of the front view. Front View Horizontal or Top View What type of projection is this drawing: A. First-angle B. Second-angle C. Third-angle D. Fourth-angle CAD/Fab Orthographic Projection 33 CAD/Fab Orthographic Projection 34 Question What type of projection is this drawing: A. First-angle B. Second-angle C. Third-angle D. Fourth-angle First-Angle vs. Third-Angle Projection The US and Canada use third-angle projection The rest of the world uses first-angle projection Symbols on drawing identify which is used ISO Standard First-angle US Standard Third-angle Front Right CAD/Fab Orthographic Projection 35 CAD/Fab Orthographic Projection 36 9
First-Angle vs. Third-Angle Projection Assignment/Due Date Sketch the appropriate views of problems (3), (6), and (19) from the ebook, Cad & Fabrication http://www.mcgrawhillcreate.com/shop. At this point you should have downloaded and read the preceding chapters. The problems are given in Figure 5.122, pages 294-5, printed page 140 & 141(when viewed online). Complete P1.6 from Howard and Musto, Introduction to Solid Modeling Using SolidWorks 2011. Sketches due at the beginning of class and SolidWorks problem due by the end of class Wednesday 2-1-12. First-Angle (Europe) Third-Angle (U.S. & Canada) CAD/Fab Orthographic Projection 37 CAD/Fab Orthographic Projection 38 10