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A sine bar is a tool used to measure angles in woodworking and metalworking. It is made of steel, stainless steel or aluminum and comes in specific dimensions for precise measurements. Users can calculate the angle using a sine calculator or graph. Precision blocks are used to raise one end of the bar to achieve a specific angle. Sine bars can be used for various applications, including setting vise angles, positioning tools, and quality control. For larger objects, workers use a sine plate or compound table.
A sine bar is a tool used to measure angles in woodworking and metalworking. It can be used to find a desired angle or to measure an existing angle within an object or project. Sine bar is typically a standard size, with a 5 inch (12.7 cm) sine bar being the most common in the U.S. In other parts of the world, a 100 mm (3.9 inch) bar tends to be the most common size , although other sizes are also available.
Manufacturers produce sine bars of very specific dimensions to ensure precise measurement capabilities. Each bar is made of steel, stainless steel or aluminum and can include one or more magnetic surfaces. The bar includes a cylinder at each end, with each cylinder equidistant from the center of the bar. These cylinders must measure exactly the same size to maintain a high level of accuracy.
To use a sine bar, workers must place the bottom of a cylinder on a flat surface. The top of the bar should rest along the angle being measured. To calculate this angle, users must divide the height of the raised end of the breast bar by the length of the bar. This figure gives the user the sine of the angle in question. Using a sine calculator or math graph, users can then calculate the size of the angle in degrees.
Many sine bars also come with graphs that tell users how high to raise one side of the bar to achieve a specific angle. users stack small steel blocks under one end of the breast bar to raise the bar to this height. These blocks, known as precision blocks or gauge blocks, come in precise units to get the desired measurement.
A sine bar can help carpenters or metal workers set a vise angle or clamp an object in place in the desired location. It can also be used to correctly position tools on a lathe or milling machine. The sine tool can also be locked in place together with an object to ensure accuracy while working. Finally, a sine bar can be used to ensure objects conform to the correct measurements and angles as part of the quality control process.
In some applications, a standard sine bar may not be large enough to measure large objects. On these products, workers use a similar tool known as a sine plate. In more complex products, users rely on a breast plate or compound table. This tool allows workers to measure compound angles over large surfaces.
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