Sine Bar

A Sine Bar is a precision measuring tool used in metrology and machining applications. It is typically made of hardened steel and consists of two parallel bars with accurately ground faces. The bars are joined together at one end by a hinge or a slip fit, allowing them to pivot.

The purpose of a Sine Bar is to measure or set angles with a high degree of accuracy. It is commonly used in conjunction with a dial indicator or height gauge to measure the angle of a workpiece or to set up a milling machine or lathe at a specific angle.

To use a Sine Bar, the workpiece or machine table is placed on the parallel bars, and the angle is set by adjusting the height of one end of the bars using precision blocks or shims. The angle can be calculated using trigonometry and the length of the Sine Bar.

Sine Bars are widely used in industries such as manufacturing, engineering, and quality control for tasks such as angle measurement, precision machining, and inspection. They are essential tools for ensuring accurate and precise measurements in various applications.