Communication Technology IOT POLY ENGINEERING 2-10 November 3, 2010 DRILL In the right view of the drawing below (PRP), point A is 2’-3” away from the frontal reference plane. In the top view drawing, how far will point A be from the frontal reference plane? In the front view drawing, how far will point A be from the frontal reference plane? 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. A Communication Technology

Objectives 2-9 The remainder of Unit 2: IOT POLY ENGINEERING 2-9 The remainder of Unit 2: Technical Graphic Communication Objectives Cover the 3 main technical drawing types and their ~12 variations Establish class standards for technical drawing Further develop and apply skills in drafting Develop and apply skills in Google Sketchup Technical Graphic Communication

SKETCHES 2-9 1 One of many drafting techniques IOT POLY ENGINEERING 2-9 SKETCHES 1 One of many drafting techniques Quick way to show an idea that would be difficult to describe with words alone Used mainly in Engineering Design Process Step 2: Brainstorm, Research, and Generate Ideas NO DRAWING TOOLS (not even a straightedge) Rules of drawing STILL APPLY Pull, don’t push LIGHT construction lines Use appropriate line weight and type TYPE 1: SKETCHES

MULTI-VIEW 2-10 2 TYPE 2: MULTI-VIEW Frontal Reference Plane IOT POLY ENGINEERING 2-10 MULTI-VIEW 2 Frontal Reference Plane Front View Horizontal Reference Plane Top View Profile Reference Plane Side View Which Reference Plane? HRP TYPE 2: MULTI-VIEW Which Reference Plane? HRP Which View? FRONT Which Reference Plane? Which View? PRP RIGHT Which Reference Plane? FRP

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

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

SECTIONAL VIEWS 2-10 2 Sectional Views TYPE 2: MULTI-VIEW IOT POLY ENGINEERING 2-10 SECTIONAL VIEWS 2 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: TYPE 2: MULTI-VIEW

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

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

IOT POLY ENGINEERING 2-10 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

IOT POLY ENGINEERING 2-10 AUXILIARY 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. FRP HRP PRP

AUXILIARY VIEWS Which Reference Plane? 2-10 HRP ARP PRP FRP 2 IOT POLY ENGINEERING 2-10 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

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

SURFACE DEVELOPMENTS 2-10 2 Stretchout Pattern Development IOT POLY ENGINEERING 2-10 SURFACE DEVELOPMENTS 2 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

IOT POLY ENGINEERING 2-10 WORKING DRAWINGS 2 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

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

ISOMETRIC 2-10 3 TYPE 3: PICTORIAL From Greek: Equal Measure IOT POLY ENGINEERING 2-10 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

PERSPECTIVE 2-10 3 TYPE 3: PICTORIAL IOT POLY ENGINEERING 2-10 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 http://www.ider.herts.ac.uk/school/courseware/graphics/one_point_perspective.html

OBLIQUE 2-10 3 A way of showing depth, like isometric IOT POLY ENGINEERING 2-10 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

IOT POLY ENGINEERING 2-10 EXPLODED ASSEMBLY 3 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) TYPE 3: PICTORIAL

CUT-AWAY PICTORIAL 2-10 3 Show the interior details of a product IOT POLY ENGINEERING 2-10 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

1 2 3 IOT - Technical Graphic Communication TECHNICAL DRAWING METHODS SKETCHES 1 No drawing tools MULTI-VIEW DRAWINGS 2 Standard Views Sectional Views Auxiliary Views Developments Working Drawings PICTORIAL DRAWINGS 3 Isometric Perspective Oblique Exploded Assembly Cutaway Pictorial

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