Lesson 2: The Horizontal Ellipse (Plate 1-3 & 1-4)

Why does a circle look like an oval in an isometric view?

What is the specific command sequence to activate an Isocircle?

Ellipse, Major Axis, Minor Axis, Isocircle.

CT CADD.04.03: Apply geometric construction techniques to pictorial drawings.

Students work on Plates 1-3 and 1-4. They will learn that standard circles are "illegal" in isometrics. They must use the Ellipse tool and select the Isocircle sub-option. They will practice centering these ellipses on the "Top" face of a block.

Purpose: To accurately represent holes and cylinders on horizontal surfaces.

DOK Level: 2.

Create a "Keyboard Shortcut" card: EL -> Enter -> I -> Enter.

Accuracy check: The ellipse must be tangent to the isometric square it resides in.

CAD Book - 3 Dimensional & 3 View Drawings 1-3 & 1-4.