IOT POLY ENGINEERING 2-16 January 26, 2010 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 QUIZ WEDNESDAY Technical Graphic Communication

IOT POLY ENGINEERING 2-10 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. review AUXILIARY VIEWS TYPE 2: MULTI-VIEW

IOT POLY ENGINEERING 2-10 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 reviewAUXILIARY VIEWS TYPE 2: MULTI-VIEW FRP HRP PRP Neither the front, top, or side view shows the true size and shape of the object’s inclined surface.

IOT POLY ENGINEERING 2-10 Review AUXILIARY VIEWS TYPE 2: MULTI-VIEW FR P PR P Which Reference Plane? HR P AR P Auxiliary Reference Plane The ARP shows true form (shape and size) for inclines

IOT POLY ENGINEERING 2-10 review ISOMETRIC TYPE 3: PICTORIAL Isometric Cube: 1) all lines equal length; 2) all faces equal area; 3) perimeter is a hexagon 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

IOT POLY ENGINEERING 2-10 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 Review PERSPECTIVE TYPE 3: PICTORIAL

IOT POLY ENGINEERING 2-10 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 Review OBLIQUE TYPE 3: PICTORIAL

IOT POLY ENGINEERING 2-10 Show the interior details of a product Often employed in instruction manuals Assists in understanding operation of product Review CUT-AWAY PICTORIAL TYPE 3: PICTORIAL

IOT POLY ENGINEERING 2-11 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 Communication Technology Review A B C D EF G E B C F G D A

IOT POLY ENGINEERING 2-11 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 Review LINE WEIGHTS Technical Graphic Communication

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

IOT POLY ENGINEERING Object Lines: –HEAVY WEIGHT –The final line type for most objects 4.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 Review LINE TYPES CLASS STANDARDS

IOT POLY ENGINEERING 2-11 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. Review SCALES CLASS STANDARDS

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

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

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

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

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”

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

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”

DRAWING ORTHOGRAPHIC PROJECTIONS 1.Draw border and title block 2.Locate starting point to center drawing (use construction) 3.Construct front view and PROJECT lines across paper 4.Construct top view and PROJECT lines across paper

DRAWING ORTHOGRAPHIC PROJECTIONS 1.Locate the top-most, right-most intersection of front view construction lines. 2.Use a 45-deg triangle and project a miter line. 3.Project lines down for right view. DARKEN what needs to be DARKENED DO NOT ERASE CONSTRUCTION LINES THEY FADE IN COMPARISON TO OBJECT LINES