We want to keep our design from rotating, so put a horizontal line through the circle’s center, with each end touching the edge of the circle. Pick a size for your circle I used a 21 mm radius. Start with a circle, centered on the origin (the center of the XY plane). It begins with a circle Cut a circle into 6 equal parts You don’t have to know how to do these operations, but it will help you understand how the trefoil is constructed. I assume you’ve learned the basics of Geometric Construction with a compass and ruler, for example how to create a line perpendicular to another, how to bisect an angle, how to construct a circle tangent to two lines and touching a point, etc. Even today teachers use these same tools to teach the basics of geometry. Until the appearance of CAD – computer aided design – programs, architects and engineers used these same two tools to draw everything from houses to airplanes. school compass (left) and 20th century architect’s compass (right) The second was a compass – often called a pair of compasses: a simple device for drawing circles and arcs. The first was a straight-edge: a ruler, for drawing straight lines. Medieval architects used two tools for laying out designs like the Trefoil – a circle divided into three rings. You can follow along with the FreeCAD file on Cults3D, or you can use your favorite CAD application, such as Autodesk Fusion 360. In this post, I show you how to design of one type of Gothic ornament, using FreeCAD. I’ve been interested in the Tracery in Gothic Cathedrals – the delicate patterns in stone walls and windows – for years.
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