Abstract: A loader assembly comprising a channel member for gravitationally delivering unground workpieces to and removing finished workpieces from the grinding station of a machine tool such as a cylindrical grinder, the channel member including a magazine portion for holding a plurality of unground workpieces, means for sequentially releasing workpieces from the magazine portion, means for stopping the gravitational displacement of a released workpiece at a predetermined ready position, locator means, means for advancing the locator means from a retracted position beyond the channel to an advanced position within the channel, means for freeing the stopped workpiece after the locator means has been displaced to the advanced position so that the freed workpiece will gravitationally locate against the advanced locating means, and means for selectively retracting the locator means from the advanced position to the retracted position.