Engineering H 191 Drafting CAD Design Process Isometric

Engineering H 191 - Drafting / CAD Design Process Isometric Drawings Lecture 6 Autumn Quarter Gateway Engineering Education Coalition 1

Engineering H 191 - Drafting / CAD Topics For Today • Using the Engineering Design Process • More Freehand Sketching – Isometric Sketches Autumn Quarter Gateway Engineering Education Coalition 2

Engineering H 191 - Drafting / CAD Engineering Design Process • 1. 2. 3. 4. • AS SHOWN IN TOOLS AND TACTICS FOR DESIGN DEFINING THE PROBLEM FORMULATING SOLUTIONS DEVELOPING MODELS AND PROTOTYPES PRESENTING AND IMPLEMENTING THE DESIGN You will do 1 & 2 in Homework this week Autumn Quarter Gateway Engineering Education Coalition 3

Engineering H 191 - Drafting / CAD Design • What is design? – PROCESS OF CONCEIVING OR INVENTING IDEAS – Start w/ brainstorming for this lab • The Art of Design – DESIGN FOR FUNCTION AND PURPOSE • The Practice of Engineering Design – PRODUCT DESIGN Autumn Quarter Gateway Engineering Education Coalition 4

Engineering H 191 - Drafting / CAD Isometric Sketching – Example & Ellipses Goals • A process for creating isometric drawings • A process for sketching ellipses for isometric drawings Reference • Earle, Section 13. 7 & 13. 8 and Chapter 25 Autumn Quarter Gateway Engineering Education Coalition 5

Engineering H 191 - Drafting / CAD Making an Isometric Sketch - Defining The Axis 60 o 30 o Isometric Axis Autumn Quarter Gateway Engineering Education Coalition 6

Engineering H 191 - Drafting / CAD Making an Isometric Sketch - Axis Convention Height Width Depth Isometric Axis Convention Autumn Quarter Gateway Engineering Education Coalition 7

Engineering H 191 - Drafting / CAD Object for Practice How would you sketch this object? Autumn Quarter Gateway Engineering Education Coalition 8

Engineering H 191 - Drafting / CAD Blocking in the Object – Begin with Front Face Height Start with Isometric Axis Width Autumn Quarter Gateway Engineering Education Coalition 9

Engineering H 191 - Drafting / CAD Blocking in the Object – Add Side Face Height Depth Autumn Quarter Gateway Engineering Education Coalition 10

Engineering H 191 - Drafting / CAD Top Face Autumn Quarter Blocking in the Object – Add Top Face Gateway Engineering Education Coalition 11

Engineering H 191 - Drafting / CAD Adding Detail – Cut Outs – Part 1 Autumn Quarter Gateway Engineering Education Coalition 12

Engineering H 191 - Drafting / CAD Adding Detail – Cut Outs – Part 2 Autumn Quarter Gateway Engineering Education Coalition 13

Engineering H 191 - Drafting / CAD Adding Detail – Cut Outs – Part 3 Autumn Quarter Gateway Engineering Education Coalition 14

Engineering H 191 - Drafting / CAD Darken Final Lines Autumn Quarter Gateway Engineering Education Coalition 15

Engineering H 191 - Drafting / CAD Isometric ellipses • In an isometric drawing, the object is viewed at an angle, which makes circles appear as ellipses. • Holes • Cylinders Autumn Quarter Gateway Engineering Education Coalition 16

Engineering H 191 - Drafting / CAD Ellipses can be in any plane Autumn Quarter Gateway Engineering Education Coalition 17

Engineering H 191 - Drafting / CAD Sketching an Isometric of a Hollow Pipe Autumn Quarter Gateway Engineering Education Coalition 18

Engineering H 191 - Drafting / CAD Step 1 - Creating the Base Box Diameter Autumn Quarter Length Gateway Engineering Education Coalition 19

Engineering H 191 - Drafting / CAD Step 2 – Ellipse on Front Face - corner to get center - lines to tangent points Tangent Points Lines to Tangent Points Autumn Quarter Gateway Engineering Education Coalition 20

Engineering H 191 - Drafting / CAD Step 3 – Ellipse on Front Face Sketch in Arcs Tangent Points Autumn Quarter Gateway Engineering Education Coalition 21

Engineering H 191 - Drafting / CAD Step 4 – Finish Ellipse on Back Face, Profile Repeat for ellipse on rear face Draw Tangent Lines for Profile Complete Visible Part of Back Ellipse Autumn Quarter Gateway Engineering Education Coalition 22

Engineering H 191 - Drafting / CAD Step 5 – Ellipse for Hole on Front Face Create Box for Hole Sketch Ellipse Autumn Quarter Gateway Engineering Education Coalition 23

Engineering H 191 - Drafting / CAD Isometric of Hollow Pipe Autumn Quarter Gateway Engineering Education Coalition 24

Engineering H 191 - Drafting / CAD Defining Hidden and Center Lines • Hidden Line – used to represent features that cannot be seen in the current view • Centerlines – used to represent symmetry and to mark the center of circles and the axes of cylinders, and the axes of symmetrical parts, such as cylinders and bolts Autumn Quarter Gateway Engineering Education Coalition 25

Engineering H 191 - Drafting / CAD Example Center Line Hidden Line Autumn Quarter Gateway Engineering Education Coalition Visible Line 26

Engineering H 191 - Drafting / CAD Precedence of Lines VISIBLE LINE takes precedence over all other lines HIDDEN LINE and CUTTING PLANE LINE take precedence over center lines CENTER LINE does not have precedence Autumn Quarter Gateway Engineering Education Coalition 27

Engineering H 191 - Drafting / CAD Example Application of Precedence Autumn Quarter Gateway Engineering Education Coalition 28

Engineering H 191 - Drafting / CAD Engineering Drawings • • Drawing Borderline and Title Block – Borderline – Space outside left blank so details are not lost if the edge of the drawing is torn – Title Block – Information about who did the drawing, when it was done, where it was saved Autumn Quarter Gateway Engineering Education Coalition 29