INDEX TABLE ASSEMBLY

摘要

An index table structure and method of indexing where the index table structure includes a table having a table top which is angularly rotatable and has a plurality of cam members around the periphery thereof including radially outwardly opening cam recesses therein having a precisely located indexed position locating surface, a dual motor brake structure for driving the portion of the table between angularly separated indexed positions, a shot pin positioned adjacent the periphery of the table top and having a precisely indexed position locating surface thereon adapted to mate with a locating surface of a cam recess with the indexed table top in a precisely indexed position, a fluid cushion structure for providing a fluid cushion for the rotatable table top and means for holding the shot pin in engagement with the locating surface in the associated cam recess the rotatable table top in rotation being released and floated on a fluid cushion and rotated in one direction whereby the shot pin is cam actuated into one of the cam recesses to approximately locate the table top in an indexed position and subsequently the table top is rotated in the opposite direction to engage the locating surfaces on the shot pin and the cam recess to precisely locate the table top in one of its indexed positions and to wedge lock the shot pin to prevent the table top from rotating out of position.