Abstract: A combination linear and circular motion roller bearing assembly have a rail and a pair of tracks, each located along a side wall of the rail. The rail forms a contiguous path having both linear and circular portions. A slider bearing assembly is movably attached to the rail. The slider bearing assembly has internal continuous paths that correspond to the tracks. Each internal path has a plurality of ball bearings therein. Each internal path has an opening adjacent the corresponding track and a tapered insert therein for exposing a predetermined number of ball bearings to the track to allow rolling movement with a respect to the track as the slider bearing assembly moves along the rail.