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Freehand Sketching & Intro to Solid Modeling in Engineering Graphics

This lecture covers the basics of freehand sketching and introduces solid modeling in engineering graphics. Topics include sketch construction, lettering, geometric construction, key features of solids, and boolean operations.

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Freehand Sketching & Intro to Solid Modeling in Engineering Graphics

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  1. Lecture 02 IENG 248: Free Hand Sketching & Intro to Solid Modeling Engineering Graphics & 3-D Modeling

  2. Texts & Materials • Suggested: • Modern Graphics Communication, 4th ed. • Giesecke, Mitchell, Spencer, Hill, Dygdon, Novak, Lockhart & Goodman • Available for rent via Amazon • Make sure all appendix pages are intact • Will get one per lab team*– stored in the lab for access • Required: • Engineering Notebook • 7-1/2" x 9-3/4", quad ruled, 80 – 100 pp • Available at the Bookstore, Staples, etc • Anything that fits in this notebook is available for exams Engineering Graphics & 3-D Modeling

  3. Materials • Required: • Engineering Problems Paper/Pad • five squares/division, 8-1/2 x 11, three hole drilled • Mechanical Pencil, 0.5 mm • good grip • Lead • HB, B • ‘Clickable’ Eraser Pencil • Plastic rather than rubber • Recommended: • Small, wireless mouse • Two buttons, with scroll-wheel • Small Engineering Triangles • 30-60-90 and 45-45-90 Engineering Graphics & 3-D Modeling

  4. Example HW Assignment Layout • No cover sheet req’d if heading blocks filled out • Use front side, never use back (grid is on the back side) IENG 248 CH X: 2.1, 2.2 IENG 248 CH X:. 2.3, 2.4 1 2 9/2/14 A. STUDENT 2 9/2/14 A. STUDENT 2 PROB. 2.1 PROB. 2.3 FULL-SECTION VIEW: ISOMETRIC VIEW: A A D Ø l H D PROB. 2.2 H ORTHOGRAPHIC MULTI-VIEW: SECT A-A PROB. 2.4 Ø l BROKEN-SECTION VIEW: D Ø l H D H Engineering Graphics & 3-D Modeling

  5. Example Lab Cover Page Layout • A cover sheet is always required for labs • Can be either handwritten or word-processed 0 9/2/14 A. STUDENT 3 ENGR 248 ENGR 248 LAB 1: LESSONS 1 - 3 LAB 1: TUTORIAL LESSONS 1-3 A. STUDENT CONTENTS CONTENTS 1: BLOCK SECTION 2: BLOCK ASSEMBLY 3: BLOCK DIMENSIONED 4: BLOCK ASSEMBLY 1: BLOCK SECTION 2: BLOCK ASSEMBLY 3: BLOCK DIMENSIONED 4: BLOCK ASSEMBLY 9/2/14 PAGE 0 OF 3 Engineering Graphics & 3-D Modeling

  6. Some Common Lines • Visible Lines • Construction Lines* • Hidden Lines • Center Lines • Dimension Lines • Extension Lines or Section Lines • Cutting Plane Lines** • Phantom Lines • Break Lines** Engineering Graphics & 3-D Modeling

  7. Sketch Construction • Block in ending, transition, and mid-points with light construction lines • Lines: • Horizontal strokes left to right (right handed) • Vertical strokes downward • Curves: • Draw with a downward motion • Use enclosing rectangles, centerlines, cards/trammels • Proportions (scaling, too): • Divide and conquer with enclosing rectangles • Use exit and entry points of background grid Engineering Graphics & 3-D Modeling

  8. Sketch Construction Engineering Graphics & 3-D Modeling

  9. Lettering • Upper case, no serifs, even width line strokes • Widths of letters: • 1, I are one unit wide • W is eight units wide • TOM Q VAXY set is six units wide • Remaining letter set is five units wide • Last two letters are almost as wide as they are tall • Top portions of a letter are usually NOT as wide/tall as bottom portions • Space between adjacent letter strokes is even, not the space between adjacent letter ‘envelopes’ Engineering Graphics & 3-D Modeling

  10. Purpose of Geo Construction • Geometric construction techniques are used for: • CAD feature creation • Layout of prototype parts for manufacture • CAD drawing creation using 2-D software or manual drafting equipment* • Compass, dividers, triangles, and T-square or drafting arm Engineering Graphics & 3-D Modeling

  11. Geometric Construction/Modeling • Terminology: • Points • Lines • Angles • Triangles • Quadrilaterals • Polygons • Circles • Arcs • Ellipses • Ogee Curve Engineering Graphics & 3-D Modeling

  12. Constructs • Tangency • Bisection • Perpendicular / Right • Orthogonal • Oblique • Radius • Diameter • Circumference Engineering Graphics & 3-D Modeling

  13. Key features: Pyramid Axis Cylinder Cone Sphere Torus Know how to generate solids – you’ll do it with SolidWorks Solid Types • Polyhedra • X - agon is a 2-D figure • X - ahedron is 3-D • Prisms • Faces • Parallelepiped • Truncated Engineering Graphics & 3-D Modeling

  14. Boolean Operations • Union • addition of material using primitives • Difference • subtraction of material using complete primitives • Intersection • salvage of material common to two primitives • Primitives are the basic solids (features) • SolidWorks primitives are related to manufacturing operations • ACIS primitives are related to geometric shape Engineering Graphics & 3-D Modeling

  15. Example Engineering Graphics & 3-D Modeling

  16. Assignment • HW02: • See links on Schedule page: • Complete “Hands On 2.2”on photocopy • Sketch Top and Front views of the “Boiler Stay” on EP paper • Complete, staple, and turn in with a cover page • Load SolidWorks & MakerBot Desktop • http://www.makerbot.com/desktop -> 64 bit version! • SolidWorks takes about 2 hours -> start & return • May only be used from SDSM&T network addresses* • Labs: • Tu, W: 3:00 – 3:50 PM MFG E lab (Rm 130) • W: 4:00 – 4:50 PM MFG E lab (Rm 130) • also Collaboration Space, Design Studios (basement) Engineering Graphics & 3-D Modeling

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