Angular Accuracy

How is the angular accuracy stated for a rotary table?

The angular accuracy is listed in arc seconds. It can be stated as a total error or +/- arc seconds. A stated total accuracy of 20 arc seconds is the total of the CW and CCW error added together, it cannot exceed 20 arc seconds. A stated accuracy of +/- 20 arc seconds is the maximum CW and CCW error cannot exceed 20 arc seconds. Optional direct mount feedback systems (Heidenhain / Renishaw / Fanuc etc.) can be installed on the rotary table to increase the accuracy.

Example of a 4^th Axis Rotary Table Installed on a VMC

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