FirstYear Engineering Program Isometric Pictorials Goals Creating an

First-Year Engineering Program Isometric Pictorials Goals • Creating an isometric sketch 1

First-Year Engineering Program Introduction to Projections Four Basic Types Note: An Isometric is special case of an Axonometric Orthographic Projections Axonometric Pictorials Oblique Perspective 2

First-Year Engineering Program Introduction to Isometric Projection CUBE • The term Isometric literally means equal measure • All planes are equally or proportionately shortened and tilted • All the major axes (X, Y, Z) are 120 degrees apart 3

First-Year Engineering Program Making an Isometric Sketch • Defining Axis 60 o 30 o Isometric Axis 4

First-Year Engineering Program Making an Isometric Sketch • Axis Convention Height Width Front view Choose the longest dimension to be the width (or the depth) for optical stability Depth Isometric Axis Convention 5

First-Year Engineering Program Making an Isometric Sketch • Axis Convention Height Depth Isometric Axis Convention Width F t n ro w e vi Choose the longest dimension to be the width or the depth for optical stability 6

First-Year Engineering Program Usage of the Grid Paper Correct orientation Incorrect orientation Note the alignment of the axes 7

First-Year Engineering Program The Transformation Between The Isometric Grid & Rectilinear Grid 8

First-Year Engineering Program Object for Practice 9

First-Year Engineering Program Blocking in the Object Begin with Front Face Height Width 10

First-Year Engineering Program Blocking in the Object Add Side Face Height Depth 11

First-Year Engineering Program Blocking in the Object Add Top Face 12

First-Year Engineering Program Adding Detail Cut Outs – Part 1 13

First-Year Engineering Program Adding Detail Cut Outs – Part 2 14

First-Year Engineering Program Adding Detail Cut Outs – Part 3 15

First-Year Engineering Program Darken Final Lines Part 4 Note: All visible edges will be darkened 16

First-Year Engineering Program Sketching a Circle 1. Draw a square whose sides are the diameter of the circle. 2. At the center of each side define the point of tangency for the circle. 3. Draw the diagonals of the square. 4. Orient the paper so you can draw equal arcs to construct the circle 17

First-Year Engineering Program Isometric ellipses • In an isometric drawing, the object is viewed at an angle, which makes circles appear as ellipses. • Holes • Cylinders 18

First-Year Engineering Program Ellipses Can be in Any of Three Planes 19

First-Year Engineering Program Sketching an Isometric of a Hollow Pipe 20

First-Year Engineering Program Step 1 - Creating the Base Box Diameter Length 21

First-Year Engineering Program Step 2 – Ellipse on Front Face (Reference Technical Graphics, Section 4. 2. 7) - Corner to corner to get center - Lines to tangent points Tangent Points Lines to Tangent Points 22

First-Year Engineering Program Step 3 – Ellipse on Front Face Sketch in Arcs Tangent Points 23

First-Year Engineering Program Step 3 – Ellipse on Back Face and Profile Repeat for ellipse on rear face Draw Tangent Lines for Profile Complete Visible Part of Back Ellipse 24

First-Year Engineering Program Step 4 – Ellipse for Hole on Front Face Create Box for Hole Sketch Ellipse 25

First-Year Engineering Program Isometric of Hollow Pipe 26

First-Year Engineering Program Summary • Technical drawings are an effective communication media • Projections of various types can be used • Isometric projections and creating isometric sketches has been introduced • Assignments will emphasize simple isometric sketches 27

First-Year Engineering Program Review Questions 1. _______ sketches present the object in a single view, with all three dimensions represented 2. _______ sketches present the object in a series of projections, each one showing only two of the objects’ three dimensions 3. Which among the following is NOT an isometric axes (Hint: Use the Isometric Grid paper for reference)? a) b) 120° 60° c) d) 60° 90° 120° 60° 120° 240° 28

First-Year Engineering Program Tips for Drawing Assignments • Follow Sketching and Text conventions from the reading assignment • Refer to reading assignment to clarify questions • Title Information is required. Avoid labels on the sketch. • Leave the construction lines – MUCH lighter and thinner than the finished lines • Include centerlines on isometrics 29

First-Year Engineering Program Tips for Drawing Assignments • Do not try to shade drawing – this is not a pencil sketching class. • Use grid paper. Try to sketch along grid lines. Practice sketching straight lines and curves on a grid sheet. 30

First-Year Engineering Program Tips for Pictorial Views • In pictorial views, hidden lines are not shown unless absolutely required for clarity • Non-visible bottom of a blind hole • Important feature of object not in direct view • In pictorial views, holes or notches without bottom/end visible should be assumed to go completely through the object. • Centerlines are to be shown on all isometric pictorials. 31

First-Year Engineering Program In Class Assignment • Drawing 9: TG 2. 23, 2. 31, 2. 37, & 2. 38 in course packet • Use Isometric Sketch Paper (ISP) 32

First-Year Engineering Program Assignments • Refer to daily assignment list 33