Abstract: A tool-head supporting structure having a hollow saddle reciprocally mounted on parallel ways surmounting a bed which is provided with a top portion that structurally directly interconnects the ways and provides a flat surface on which metal chips and the like created by the machining operation can collect ahead of the saddle. The forward feed motion of the saddle is limited by a fixed stop which is mounted on the bed beneath the saddle where, for all practical purposes, it is tamper free. Access is had to the stop for servicing or replacement when necessary through an opening in the front of the saddle, and the access opening normally is closed by a removable plate on which is mounted a wiper that pushes chips ahead of the saddle into a suitable chip trough and disposal system, whereby to prevent the chips from inadvertently lodging and accumulating around the stop and interfering with proper forward positioning of the saddle which in most if not all instances must be precise.