Definition of a Combination Square

One tool used in woodworking and metalworking is the combination square, which acts as many tools in one. It also fits compactly in any toolbox. The combination square is used by professionals and amateurs.

Definition

A combination square is a straightedge with ruled measurements and consists of multiple, interchangeable heads that can be attached. Each one performs a different function.

Angle Measurement

One of these attachments allows the combination square to measure accurate angles. Usually, it measures only 90- or 45-degree angles, though some allow a full range of multiple angles.

Ruler

The ruler is used to measure distances in millimeters, centimeters and inches. It's also used to determine the flat face side of a wooden board.

Protractor

Combination squares also act as protractors. These allows for perfect circles or curves to be marked before a piece of wood or metal is cut.

Level

The protractor and the angle attachments contain levels. These help ensure that a piece of wood or metal is level before being worked on.

Resources

• Popular Mechanics on the Combination Square