• Engineering graphics / technical drawing courses
• Layout planning for parts or patterns
• Understanding projections (VP = Vertical Plane, etc.)

What it’s used for

It’s mainly used to:

• Show true shapes and relationships between objects
• Help visualize projections and intersections
• Guide precise construction before creating a final CAD model

How to make it in AutoCAD

You don’t draw this as a single command, it’s built step by step:

1. Start with construction lines (XLINE or LINE) for center axes
2. Draw the main circle (CIRCLE) from the center
3. Create the outer rotated square (diamond) using POLYGON (4 sides) or lines + rotation
4. Use OFFSET for parallel lines
5. Use TRIM / EXTEND to clean intersections
6. Add construction arcs/circles to find key points
7. Use layers or linetypes (dashed) for hidden/construction geometry

How it’s “used” in practice

In real CAD work, this type of drawing is more of a planning/understanding tool rather than something you deliver. Once you understand the geometry, you’d typically:

• Recreate it as a clean 2D drawing, or
• Convert it into a 3D model (extrude, revolve, etc.)