Sine Plate
A sine plate is a precision measurement tool built of finely ground or lapped steel, used to measure angles for parts or for measuring angled parts. A sine plate is very similar to a sine bar in build and function with a few differences. Similar to a surface plate, a sine plate is much wider than a sine bar and built connected to a hinge that then connects to a base plate located at the bottom cylinder. A sine plate is generally use as a precision measurement tool, but may also be used as a fixturing device.