Table control Ultradex (precision index) is one of the most important instruments in angular measurement. When drilling a hole with an angle respect to the machining surface, the accuracy of the angle becomes very important. The table mentioned in this paper can be operated through a computer controlled system. This paper presents a convenient way of calibration Table control Ultradex. The classical way of calibrating this instrument using a standard polygon will introduce the uncertainty of itself and the instrument under test. To demonstrate the traceability uncertainty can be narrowed to 1/4 arc second, the theory of a new calibration method is introduced in this paper. Hopefully readers will have some ideas after reading it.
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