A peck feed drill incorporates a motor gear quill and a feed control assembly together on a moving race track shaped piston. External construction of the housing permits mounting of an indexing adaptor plug for attachment of drill bushings. Internal construction of the housing provides for passage of air to the various components to which control tool operation. Valves within the air logic circuitry are multi-functional to minimize the number of parts.
This application is a divisional of application Ser. No. 08/346,326, filed Nov. 29, 1994, now U.S. Pat. No. 5,533,842, which is a File Wrapper Continuation of Ser. No. 07/839,974 filed on Feb. 21, 1992 now abandoned.
A power feed apparatus for applying a thrust force to an output shaft of a motor driven tool to drive the output shaft linearly towards and away from a workpiece without applying off-axis forces to the output shaft that would cause it to move out of perfect perpendicular alignment to the outer surface of the workpiece. The apparatus includes a first tubular member which is fixedly secured to a jig or other like mounting structure associated with the workpiece. A second tubular member is disposed for sliding linear movement along the first tubular member. Spaced apart annular fluid chambers are formed within the apparatus along with associated fluid ports for allowing a pressurized fluid to be used to both extend and retract the output shaft of the tool. The tool itself is supported on the second tubular member and thus moves linearly along with the second tubular member.
The invention provides a drilling apparatus and method for drilling a hole in a workpiece. The drilling apparatus includes means for rotating a drill bit and means for advancing the rotating drill bit into a workpiece to a first depth. The drilling apparatus further includes means for dwelling the drill bit within the workpiece at the first depth for a dwell time and means for further advancing the rotating bit to a second depth after the dwell time has expired. The drilling method includes rotating a drill bit and advancing the rotating drill bit into the workpiece to a first depth. The method farther includes dwelling the drill bit within the workpiece at the first depth for a dwell time and further advancing the rotating bit to a second depth after the dwell time has expired.
