Introduction to Engineering Introduction to Isometric Ellipse Agenda: l. Sketching of ellipse for isometric drawings l. Introduce concepts and conventions of multi-view projections l. Reference: IGCE, Chap 2: 2. 4. 2
Recall – Before starting Bike Lab 1 we developed an approach to doing an isometric projection Today - Build on that base and learn how to do circular features (holes and cylinders) in an isometric projection
Review l Sketch an isometric of this object D H W l Start with a block with dimension W, H, D l “Cut away” material you don’t need
Isometric ellipses l In an isometric drawing, the object is viewed at an angle, which makes circles appear as ellipses. l Holes l Cylinders
Ellipses can be in any of three planes
Sketching an Isometric of a Hollow Pipe
Step 1 - Creating the Base Box Diameter Length
Step 2 – Ellipse on Front Face - corner to get center - lines to tangent points Tangent Points Lines to Tangent Points
Step 3 – Ellipse on Front Face Sketch in Arcs Tangent Points
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
Step 4 – Ellipse for Hole on Front Face Create Box for Hole Sketch Ellipse
Isometric of Hollow Pipe
Example
Assignment #3: Isometric Sketch l Complete the isometric sketch of the object below: