NC circular table and NC circular table apparatus

The present invention relates to a circular table for NC control table laid on a table of NC machine tool for performing a rotating or indexing operation of workpiece (hereinafter referred to as an NC circular table) and ail NC circular table apparatus. An NC machine tool includes an NC circular table and an NC circular table apparatus which dispense with the original restoration or calibration operation in an absolute type encoder using a backup battery. The NC circular table has an NC controller for performing a positional detection by an absolute type encoder and a backup battery for the encoder is provided in the NC circular table body.