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

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

First-Year Engineering Program 3 Introduction to Isometric Projection 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  CUBE 

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

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

First-Year Engineering Program 6 Width Depth Height Isometric Axis Convention Making an Isometric Sketch Axis Convention Front view Choose the longest dimension to be the width or the depth for optical stability

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

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

First-Year Engineering Program 9 Object for Practice

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

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

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

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

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

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

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

First-Year Engineering Program 17 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

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

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

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

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

First-Year Engineering Program 22 Step 2 – Ellipse on Front Face (Reference Technical Graphics, Section 4.2.7) Lines to Tangent Points - Lines to tangent points - Corner to corner to get center Tangent Points

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

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

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

First-Year Engineering Program 26 Isometric of Hollow Pipe

First-Year Engineering Program 27 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

First-Year Engineering Program 28 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) d) c) 120° 60° 240° 60° 90°

First-Year Engineering Program 29 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 Tips for Drawing Assignments

First-Year Engineering Program 30 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. Tips for Drawing Assignments

First-Year Engineering Program 31 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.

First-Year Engineering Program 32 In Class Assignment Drawing 9: TG 2.23, 2.31, 2.37, & 2.38 in course packet Use Isometric Sketch Paper (ISP)

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