Set square

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Set square is a tool used in technical drawing and engineering for drawing straight lines and precise angles. Typically made from plastic, metal, or sometimes wood, set squares are crucial in ensuring accuracy and consistency in manual drafting and design work. There are two main types of set squares: the 45-degree set square and the 30/60-degree set square, each named after the angles they can create.

Types of Set Squares

45-Degree Set Square

The 45-degree set square is right-angled, with one 45-degree angle and two 45-degree angles at the other corners. It is commonly used for drawing perpendicular lines and bisecting right angles.

30/60-Degree Set Square

The 30/60-degree set square has one right angle, one 30-degree angle, and one 60-degree angle. This type of set square is versatile for drawing hexagons, equilateral triangles, and any work requiring 30-degree or 60-degree angles.

Usage

Set squares are primarily used in conjunction with a drawing board, T-square, and drafting table to draw parallel lines, perpendicular lines, and to inscribe predetermined angles accurately. They are essential tools in architecture, engineering, and various design fields. In educational settings, set squares are used to teach geometry and drafting techniques.

Material and Design

Modern set squares are usually made of transparent plastic, which allows the user to see the drawing or drafting paper beneath. This transparency is crucial for precision and accuracy in drawing. Some set squares also have inbuilt protractors for measuring angles more precisely and may include edges marked with measurements for additional functionality.

Historical Context

Before the advent of computer-aided design (CAD), set squares were indispensable in the drafting process. They have a long history in engineering and architecture, with their use dating back to when drawings were done entirely by hand. Although the prevalence of CAD software has reduced the necessity for manual drawing tools, set squares remain a fundamental part of the education in related fields and are still used by professionals for quick sketches and when precision is required without digital means.

See Also

• Technical drawing
• Drafting table
• T-square
• Protractor
• Computer-aided design

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