Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 1Autumn Quarter Design Process Isometric Drawings Lecture 6

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 2Autumn Quarter Topics For Today Using the Engineering Design Process More Freehand Sketching –Isometric Sketches

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 3Autumn Quarter Engineering Design Process AS SHOWN IN TOOLS AND TACTICS FOR DESIGN 1.DEFINING THE PROBLEM 2.FORMULATING SOLUTIONS 3.DEVELOPING MODELS AND PROTOTYPES 4. PRESENTING AND IMPLEMENTING THE DESIGN You will do 1 & 2 in Homework this week

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 4Autumn Quarter 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

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 5Autumn Quarter 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

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 6Autumn Quarter 30 o 60 o Isometric Axis Making an Isometric Sketch - Defining The Axis

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 7Autumn Quarter Depth Width Height Isometric Axis Convention Making an Isometric Sketch - Axis Convention

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 8Autumn Quarter Object for Practice How would you sketch this object?

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 9Autumn Quarter Front Face Height Width Blocking in the Object – Begin with Front Face Start with Isometric Axis

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 10Autumn Quarter Height Depth Side Face Blocking in the Object – Add Side Face

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 11Autumn Quarter Top Face Blocking in the Object – Add Top Face

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 12Autumn Quarter Adding Detail – Cut Outs – Part 1

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 13Autumn Quarter Adding Detail – Cut Outs – Part 2

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 14Autumn Quarter Adding Detail – Cut Outs – Part 3

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 15Autumn Quarter Darken Final Lines

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 16Autumn Quarter Isometric ellipses In an isometric drawing, the object is viewed at an angle, which makes circles appear as ellipses. Holes Cylinders

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 17Autumn Quarter Ellipses can be in any plane

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 18Autumn Quarter Sketching an Isometric of a Hollow Pipe

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 19Autumn Quarter Step 1 - Creating the Base Box Diameter Length

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 20Autumn Quarter Step 2 – Ellipse on Front Face Lines to Tangent Points - lines to tangent points - corner to corner to get center Tangent Points

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 21Autumn Quarter Step 3 – Ellipse on Front Face Tangent Points Sketch in Arcs

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 22Autumn Quarter Step 4 – Finish Ellipse on Back Face, Profile Draw Tangent Lines for Profile Complete Visible Part of Back Ellipse Repeat for ellipse on rear face

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 23Autumn Quarter Step 5 – Ellipse for Hole on Front Face Create Box for Hole Sketch Ellipse

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 24Autumn Quarter Isometric of Hollow Pipe

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 25Autumn Quarter 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

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 26Autumn Quarter Example Visible Line Center Line Hidden Line

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 27Autumn Quarter 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

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 28Autumn Quarter Example Application of Precedence

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lect 5P. 29Autumn Quarter 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