IOT POLY ENGINEERING

1. January 26, 2010 IOTPOLYENGINEERING 2-16 QUIZ WEDNESDAY • Matching and Fill-in-the-Blank • Identifying drawing types • Isometric, section, standard view, development, perspective, oblique, cut-away pictorial • Reference planes • FRP, HRP, PRP • Class standards • Line weight, line type, dimensioning, scales Technical Graphic Communication

2. IOTPOLYENGINEERING 2-10 review AUXILIARY VIEWS 2 • So far, our standard 6 views are all visible using the three regular planes of projection • Frontal Reference Plane • Horizontal Reference Plane • Profile Reference Plane • Those views are drawn TRUE SIZE • However, inclines (slants) are not shown as true size in standard views. TYPE 2: MULTI-VIEW

3. HRP IOTPOLYENGINEERING 2-10 PRP FRP reviewAUXILIARY VIEWS 2 • Inclines (slants) are not shown as true size in standard views. • Each square below represents 1”. What are the widths of the front view and right side views? • 9” and 4”, respectively TYPE 2: MULTI-VIEW • Neither the front, top, or side view shows the true size and shape of the object’s inclined surface.

4. IOTPOLYENGINEERING 2-10 Review AUXILIARY VIEWS 2 The ARP shows true form (shape and size) for inclines Which Reference Plane? HRP Auxiliary Reference Plane ARP TYPE 2: MULTI-VIEW PRP FRP

5. IOTPOLYENGINEERING 2-10 review ISOMETRIC 3 • From Greek: Equal Measure • Isos: Equal • Metron: Measure • The scale along each axis of the projection is the same • True form parallel lines are shown as parallel (note colors below) • All isometrics: simple construction TYPE 3: PICTORIAL Isometric Cube: 1) all lines equal length; 2) all faces equal area; 3) perimeter is a hexagon

6. IOTPOLYENGINEERING 2-10 Review PERSPECTIVE 3 • Latin: perspicere – to see through • An approximate representation of an image as it is perceived by the eye. • The most characteristic feature of perspectives is that objects are drawn: Smaller as their distance from the observer increases TYPE 3: PICTORIAL

7. IOTPOLYENGINEERING 2-10 Review OBLIQUE 3 • A way of showing depth, like isometric • Part orthographic / part isometric: • One face is true form • Parallel lines behind; either: • Full scale • Half scale • Three-quarter scale TYPE 3: PICTORIAL

8. IOTPOLYENGINEERING 2-10 Review CUT-AWAY PICTORIAL 3 • Show the interior details of a product • Often employed in instruction manuals • Assists in understanding operation of product TYPE 3: PICTORIAL

9. IOTPOLYENGINEERING 2-11 Review • Turn in your 3-view assignment (include NAME) • Match the type of Technical Graphics below with its type: Isometric Section Standard View Development Perspective Oblique Cut-away Pictorial B C A E B C F G D A D E F • Communication Technology G

10. IOTPOLYENGINEERING 2-11 Review LINE WEIGHTS Four Weights in this class: Light: not noticeable from 2’ (nearly invisible) Medium: just noticeable from 2’ Heavy: obvious from 2’ (final weight for most objects) Very Heavy: only used for borders Technical Graphic Communication

11. IOTPOLYENGINEERING 2-11 review LINE TYPES • Construction/Layout Lines • LIGHT WEIGHT • ALL lines begin as these • DO NOT ERASE (unless there is a measuring error) • Guidelines • LIGHT WEIGHT • Used for LETTERING CLASS STANDARDS

12. IOTPOLYENGINEERING 2-11 Review LINE TYPES • Object Lines: • HEAVY WEIGHT • The final line type for most objects • Hidden Lines: • HEAVY WEIGHT • Everything must be represented in each view, whether or not it can be seen • Interior and exterior features are projected from view to view in the same way • Parts not seen on the exterior of a view are drawn with hidden lines – short DASHES CLASS STANDARDS

13. IOTPOLYENGINEERING 2-11 Review SCALES • Objects to be drawn may be small • Nanotechnology machine parts, for example • Objects to be drawn may be big • Buildings, bridges, airliners, oil rigs, trucks, cars • Full Scale drawings will not always fit on a sheet of paper • Scale down or scale up ½” = 1’-0” ¼” = 1’-0” 1” = 14’-0” • Scale must be indicated in your title block • Architect’s Scale, Engineer’s Scale, Metric Scale make scaling drawings simpler. CLASS STANDARDS

14. IOTPOLYENGINEERING 2-16 ORTHOGRAPHIC PROJECTIONS • Due by end of class Today • Use spacing of .5” between views for second Orthographic Projection Technical Graphic Communication

17. 1. Draw ½” border 2. Draw a 5/16” title block 3. Add 2 LIGHT lettering guidelines, 1/16” from border lines 4. Add scale separator – Heavy Weight ½” 5/16” 1 ¾” • LETTER the title block information: • BPI-IOT ORTHO PROJ 1 17 OCT 08 LAST, F FULL SCALE

18. 5. Measure the overall width and height of drawing space W H

19. HORIZONTAL STARTING POINT 1. Add width of front view to width of right view. 2. Add the space we will put between: 1.5” 4” 1.5” 1.5” 4” + 1.5” + 1.5” = 7”

20. 3. The remaining space is equal to W – 7” = ~3”. 4. Divide the remaining space by 2 to get horizontal pt. Horizontal Starting Point is 1.5”

21. VERTICAL STARTING POINT 1. Add height of front view to height of top view. 2. Add the space we will put between: 1.5” 1.5” 1.5” 2.5” 2.5” + 1.5” + 1.5” = 5.5”

22. 3. The remaining space is equal to H – 5.5” = ~1.75”. 4. Divide the remaining space by 2 to get vertical pt. Vertical Starting Point is 7/8”

23. DRAWING ORTHOGRAPHIC PROJECTIONS • Draw border and title block • Locate starting point to center drawing (use construction) • Construct front view and PROJECT lines across paper • Construct top view and PROJECT lines across paper

24. DRAWING ORTHOGRAPHIC PROJECTIONS • Locate the top-most, right-most intersection of front view construction lines. • Use a 45-deg triangle and project a miter line. • Project lines down for right view. DO NOT ERASE CONSTRUCTION LINES THEY FADE IN COMPARISON TO OBJECT LINES DARKEN what needs to be DARKENED