Patent ID: 8747033

Claim:
A tool for machining a workpiece comprising: a housing having an open distal end; a drive source in the housing and having a spindle coaxial with the housing; a chuck body mounted on an end of the spindle for rotation therewith; an axial cavity in the chuck body that intersects a radial opening in the chuck body; a non rotating sleeve circumscribing a portion of the chuck body and having a mid portion with an inner diameter greater than an outer diameter of the chuck body, defining an annular gallery recess between the sleeve and the chuck body that is in fluid communication with the radial opening in the chuck body; proximal and distal bearings between the outer diameter of the chuck and the annular sleeve at proximal and distal edges of the gallery recess; the chuck body having a distal portion extending past the sleeve toward the distal end of the housing, the distal portion of the chuck body having a set of external threads; a retainer nut in engagement with the external threads and cooperatively bearing against the distal bearing to retain the sleeve on the chuck body; a machining element affixed on a distal end of the chuck body distal from the retainer nut for protrusion through the distal end of the housing; a passage formed through the machining element, so that an end of the machining element opposite the chuck body is in fluid communication with the cavity; a fluid flow line extending through an opening in the housing and a port formed radially through the sleeve and having an end in fluid communication with the cavity through the gallery recess and the radial opening, so that fluid flowing through the fluid flow line into the cavity is flowable through the passage in the machining element; wherein: the machining element has a proximal end located in the cavity; and the cavity has an inner diameter that is greater than the proximal end of the machining element from the radial opening to the distal end of the chuck body.