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IOT POLY ENGINEERING 2-10 A In the right view of the drawing below (PRP), point A is 2-3 away from the frontal reference plane. 1.In the top view drawing,

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Presentation on theme: "IOT POLY ENGINEERING 2-10 A In the right view of the drawing below (PRP), point A is 2-3 away from the frontal reference plane. 1.In the top view drawing,"— Presentation transcript:

1 IOT POLY ENGINEERING 2-10 A In the right view of the drawing below (PRP), point A is 2-3 away from the frontal reference plane. 1.In the top view drawing, how far will point A be from the frontal reference plane? 2.In the front view drawing, how far will point A be from the frontal reference plane? Communication Technology DRILL October 10, )2-3 2)2-3 If point A is 2-3 away from the FRP in the right view, point A will ALWAYS be 2-3 away from the FRP.

2 IOT POLY ENGINEERING 2-10 –Frontal Reference Plane »Front View –Horizontal Reference Plane »Top View –Profile Reference Plane »Side View MULTI-VIEW TYPE 2: MULTI-VIEW Which Reference Plane? HRP Which Reference Plane? PRP Which View? FRONT Which Reference Plane? HRP FRP Which View? RIGHT Which Reference Plane? Do not leave class without homework handout

3 IOT POLY ENGINEERING 2-10 Reference Planes: –Frontal Reference Plane »Front View –Horizontal Reference Plane »Top View –Profile Reference Plane »Side View MULTI-VIEW TYPE 2: MULTI-VIEW Which Reference Plane? FRP Which Reference Plane? PRP Which View? TOP

4 IOT POLY ENGINEERING 2-10 Reference Planes: –You can also have multiple positions of the same reference planes MULTI-VIEW

5 IOT POLY ENGINEERING 2-10 Sectional Views –How an object looks if a cut were made through it perpendicular to the direction of sight. –For example, if we cut the shape below at PRP 2 and drew the shape (including its insides) we would have a sectional view: SECTIONAL VIEWS TYPE 2: MULTI-VIEW

6 IOT POLY ENGINEERING 2-10 Sectional Views –Different materials have different sectional views SECTIONAL VIEWS TYPE 2: MULTI-VIEW

7 IOT POLY ENGINEERING 2-10 Examples SECTIONAL VIEWS TYPE 2: MULTI-VIEW

8 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. AUXILIARY VIEWS TYPE 2: MULTI-VIEW

9 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 AUXILIARY VIEWS TYPE 2: MULTI-VIEW FRP HRP PRP Neither the front, top, or side view shows the true size and shape of the objects inclined surface.

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

11 IOT POLY ENGINEERING 2-10 TYPE 2: MULTI-VIEW SURFACE DEVELOPMENTS

12 IOT POLY ENGINEERING 2-10 Stretchout Pattern Development Used by many industries: –Pipes and ducts –Aircraft and automobile parts –Storage tanks –Cabinets –Boxes and cartons –Packages Packaging is a very large industry that uses surface developments. TYPE 2: MULTI-VIEW SURFACE DEVELOPMENTS

13 IOT POLY ENGINEERING 2-10 Tells all that needs to be known for making a single part or a complete machine or structure –Precise size and shape –What materials are used –How finishing should be done (roughness/smoothness) –Degree of accuracy (% Error allowed) TYPE 2: MULTI-VIEW WORKING DRAWINGS

14 IOT POLY ENGINEERING 2-10 Pictorial drawings show a likeness (shape) of an object as viewed by the eye. PICTORIAL DRAWINGS TYPE 3: PICTORIAL

15 IOT POLY ENGINEERING 2-10 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

16 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 PERSPECTIVE TYPE 3: PICTORIAL

17 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 OBLIQUE TYPE 3: PICTORIAL

18 IOT POLY ENGINEERING 2-10 Take an object and separate into individual parts Usually employed in instruction manuals Typically drawn in parallel projection (notice there is no perspective in the examples below) EXPLODED ASSEMBLY TYPE 3: PICTORIAL

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

20 IOT POLY ENGINEERING 2-10 Complete the orthographic projection worksheet, front and back HOMEWORK Communication Technology


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