Abstract: A machine with dovetail ways has a slide guided thereon by means of four sets of recirculating linear roller bearing cartridges, two sets of cartridges at each side of the slide engage the two ways. Each set of cartridges is mounted on a support bracket secured to the slide so that the roller bearings of one cartridge engage the upper horizontal face of the way and the roller bearings of the other cartridge engage the downwardly inclined face of the way. The cartridges for the bearings which engage the inclined face of the ways are rotatively supported on an eccentric shaft which enables the cartridges to be shifted toward and away from the inclined surface of the way to preload the bearing assembly and to accurately align the slide relative to the ways.