Abstract: A system for washing chips from the inside diameter of a workpiece. The chip washing system significantly improves the efficiency of a lathe used to machine the inside diameter of a workpiece having a longitudinal flow passage therethrough. The system injects a large volume of fluid into the end of the longitudinal flow passage opposite the end into which a machining tool or boring bar is inserted. The fluid flow removes metal chip cut from the inside diameter of the workpiece. The time that the machining tool or boring bar can be used without damage is increased by both increased cooling at the point of contact with the workpiece and preventing metal chips from becoming fouled around the boring bar.