Isometric Projection

Isometric projection is a method for visually representing three-dimensional objects in two dimensions.

This document provides the principles of isometric projection, including the drafting aids that can be used, the detent settings for a drafting machine, and how to represent circles and ellipses in isometric projection.

Questions

• What are the drafting aids for drawing in isometric projection?
• What are the detent settings for a drafting machine when used without a grid?
• How are circles represented in isometric projection?
• How are ellipses represented in isometric projection?

Answers

• The drafting aids for drawing in isometric projection are drafting machines and isometric grids.
• The detent settings for a drafting machine when used without a grid are vertical, -30 degrees to the horizontal, and +30 degrees to the horizontal.
• Circles are represented in isometric projection as ellipses with a major axis to minor axis ratio of 1:0.82.
• Ellipses are represented in isometric projection as ellipses with a major axis to minor axis ratio of 1:1.7.