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How do you use set square in architecture?

Published in Architectural Drafting Tools 2 mins read

Set squares are fundamental tools in architectural drafting for accurately drawing straight lines at specific angles, crucial for creating precise plans, elevations, and sections.

In architectural drawing, set squares are primarily used in conjunction with a T-square or parallel bar to draw vertical and angled lines quickly and accurately, ensuring all lines are parallel or perpendicular where intended.

Key Uses of Set Squares in Architecture

Architects and drafters rely on set squares for several essential drawing tasks:

  • Drawing Vertical Lines: As demonstrated in the reference video ("So same as with the other. One. We can draw vertical lines again like so on this side."), a set square placed against a parallel bar or T-square allows for the easy and accurate drawing of lines perpendicular to the horizontal edge.
  • Drawing Angled Lines: Different types of set squares enable the drawing of standard angles. The reference mentions, "And we can also draw 30 degree angles. If we rotate." This refers to using a 30-60-90 set square to draw lines at 30 or 60 degrees relative to the horizontal, and a 45-45-90 set square for 45-degree angles.
  • Drawing Parallel Lines: By sliding a set square along a T-square or parallel bar, multiple parallel lines can be drawn quickly.
  • Drawing Perpendicular Lines: Set squares are perfect for drawing lines exactly perpendicular to another line, a fundamental requirement in architectural plans.
  • Constructing Geometries: They help in constructing accurate geometric shapes, determining corners, and laying out grid systems on a drawing.

Types of Set Squares Used

Two main types of set squares are common in architectural drafting:

  1. 45-45-90 Set Square: This triangular ruler has angles of 45°, 45°, and 90°. It is used to draw lines at 45 degrees and, when used with a T-square, vertical (90 degree) lines.
  2. 30-60-90 Set Square: This triangular ruler has angles of 30°, 60°, and 90°. It is essential for drawing lines at 30, 60, and, with a T-square, 90 degrees. As the reference highlights, rotating this set square allows for both 30° and 60° lines relative to the horizontal.

Set Square Applications

Angle Set Square Type Application Examples
90° (Vertical) Both Walls, columns, door/window edges
30° 30-60-90 Isometric projections, roof pitches, staircases
45° 45-45-90 Section cuts, roof pitches, furniture details
60° 30-60-90 Isometric projections, roof pitches

Set squares provide the precision needed for technical drawings, ensuring that every line is accurate, which is paramount in communicating architectural designs.