Find the gauge block stack height needed under one end of a sine bar to set a precise angle.
Stack height = sine bar length x sin(angle). This is the height of gauge blocks to place under the roller at one end while the other end rests on the surface plate or fixture.
How it works
A sine bar sets an angle by lifting one end a calculated amount over a known length, so the angle is defined entirely by the ratio of stack height to bar length, the same relationship as the opposite and hypotenuse of a right triangle.
FAQ
Why use a sine bar instead of a protractor? A sine bar paired with gauge blocks can hold an angle to a few arc-seconds of accuracy, far tighter than a mechanical protractor or digital angle finder.
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