Pragati Automation Pvt. Ltd. Offers Index Tables with Three Piece Coupling. Pragati Automation Pvt. Ltd. Manufactures Machine Tool Accessories particularly for CNC Machines. The Index Tables with Three Piece Coupling have been developed on the lines of BTP series of turrets. The Index Tables with Three Piece Coupling has Indexing positions of 8 or 12. The Index Tables with Three Piece Coupling has Repeat positioning accuracy: ± 2. The Index Tables with Three Piece Coupling includes three piece coupling, electrical operation and encoder fed back.