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Technical Communications

Technical Communications. Objectives. Understanding graphics as a communication tool Technical sketching Projections Orthographic Pictorial Sketching hints Lettering. How Would You Describe This?. In teams of two, describe using only words How effective is this approach?.

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Technical Communications

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  1. Technical Communications

  2. Objectives • Understanding graphics as a communication tool • Technical sketching • Projections • Orthographic • Pictorial • Sketching hints • Lettering

  3. How Would You Describe This? • In teams of two, describe using only words • How effective is this approach?

  4. Three Basic Types of Technical Drawings • Freehand sketches • Instrument drawings • Computer drawings and models

  5. Introduction to Projections • Present 3-D objects with 2-D media • Two Basic Categories OrthographicPictorial

  6. Orthographic Projections Projections: Four Basic Types Axonometric Pictorials Oblique Perspective

  7. Orthographic Projections • Collection of 2D drawings • Accurately represent object • Technical Graphics

  8. Orthographic Projection

  9. Defining the SixPrincipal ViewsorOrthographic Views

  10. Which Views to Present? • General Guidelines • Pick a Front View that is most descriptive of object • Normally the longest dimension is chosen as the width (or depth) • Most common combination of views is to use: Front, Top, and Side View • Views other than the Principal Views are called Auxiliary Views

  11. Width Top View Depth Right Side View Front View Height Conventional Orthographic Views

  12. Hidden Lines – represent features that cannot be seen in the current view • Centerlines – represent symmetry and mark the center of circles, the axes of cylinders, and the axes of symmetrical parts, such as bolts Hidden and Center Lines in Orthographic Projections • Object Lines – represent visible features for an object

  13. For Example: 1. Visible 2. Hidden 3. Center

  14. Creating the Orthographic Projection Sketch • Front View • Right Side View • Top View

  15. Use very light lines for drawing in the construction lines Step 1 – Lightly Block Three Views

  16. Step 2 – Lightly Block Major Features • Holes • Arcs • Cutouts Use very light lines for drawing in the construction lines

  17. Step 3 – Refine and Locate Features in All Views Use very light lines for drawing in the construction lines

  18. Step 4 – Add Final Lines Use very light lines for drawing in the construction lines

  19. Completed Sketch

  20. Add Another View • Sketch the left side view of the object • Compare your view with the others at your table

  21. Add Another View • Does yours look something like this?

  22. Lettering Notes • Lettering Guidelines – Technical Graphics: Chapter 1 • Lettering Styles • Shape of Letters • Order of drawing lines • Character Uniformity • Spacing

  23. Lettering – Vertical Gothic Font

  24. Sketching Tips: General • Relax and draw in a direction comfortable to you • Mark end points of the lines to be sketched and draw between them • Draw long lines as a series of short ones • Use grid paper when available • Follow sketching and text conventions • Do NOT use a straight edge to draw lines!

  25. Sketching Tips: Construction Lines • Use construction lines • Begin by drawing bounding boxes with construction lines • Make construction lines much lighter and thinner than finished lines • Identify the major features and overall dimensions • Leave construction lines on the sketch

  26. Sketching Tips: Miscellaneous • Do not shade the drawing – this is not pencil sketching • Title information is required • Keep views aligned (very important) • Include centerlines on isometrics • Avoid labels on the sketch • Draw neat circles – change page orientation if needed

  27. Creating Production Drawings Goals • Understand production drawings, including detail drawings and assembly drawings Reference • Technical Graphics

  28. Mechanical Production Drawings • Production drawings (sometimes called Working drawings) are the complete set of drawings specifying the manufacture and assembly of a product. • Generally consists of multiple drawings, on multiple sheets. A title block appears on each sheet. • May contain written instructions called specifications.

  29. Set of Production Drawings A set of Production Drawings has three main parts: • Detail drawings of each non-standard part, usually one part per "sheet". • An assembly drawing (or subassembly drawings) showing all parts in a single drawing. • A bill of materials (BOM). This is essentially a parts list.

  30. Reading Production Drawings • Our first goal is to learn how to read a set of production or working drawings. • Example: simple fingernail clipper

  31. Example 1 – Assembly Drawing

  32. Full Section View

  33. Detailed Part Drawing: Rivet

  34. Detailed Part Drawing: Bottom Clipper

  35. Assembly Drawing

  36. AU 2006 Example 2 – Butterfly Valve Isometric Half- sectioned isometric Exploded

  37. Individual Part Drawings

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