Sine Bars

Sine bars are used in conjunction with slip gauge blocks for precise angular measurement. A sine bar is used either to measure an angle very accurately or face locate any work to a given angle offering a high degree of accuracy in measuring angles for milling, grinding and inspection applications.

The sine bar forms the hypotenuse of a right angle triangle, while the slip gauge blocks form the opposite side.  The height of the slip gauge block is found by multiplying the sine of the desired angle by the length of the sine bar.