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A frame square, also known as a framing square, is a versatile tool used by carpenters and builders to measure and mark up 90-degree and 45-degree angles. It is an essential tool for anyone working with wood and building structures. A typical frame square consists of two arms, a tongue, and a blade, forming an “L” shape.

The long arm of the frame square is known as the blade, and the shorter arm is called the tongue. The blade and tongue run perpendicular to each other and are joined at the heel, forming a right-angle triangle. The outer edge of the blade is marked with various measurements, usually in inches. On the inner side of the tongue, there are tables for converting measurements, calculating angles, and determining rafter lengths.

The frame square has two primary purposes. The first purpose is to mark out a perfect 90-degree angle. A right-angle triangle forms when the blade and tongue are placed together. One edge of the blade can be held flush to the wood, while the tongue is used to trace a line at a right-angle to the wood’s edge.

The second purpose of a frame square is to mark out angles that measure 45 degrees. To do this, the tongue is set at the 45-degree angle, and a line is traced using the blade. This feature is especially useful when cutting rafters.

In addition, the frame square can be used for many other tasks, such as measuring depth, and checking for level and plumb. The square is also handy for checking the squareness of an assembly and marking parallel lines.

Frame squares come in various sizes, with the most common being six inches by sixteen inches. The larger the frame square, the easier it is to make accurate measurements and the more versatile it becomes. However, a smaller frame square may be more convenient for carrying around and using in tight spaces.

In conclusion, the frame square is an essential tool for any carpenter or builder. It is a versatile tool that can be used for measuring, calculating angles, and checking for level and plumb. So, whether you are a professional or a DIY enthusiast, a frame square is a sound investment!