A rotary cutter includes a pair of recessed receivers which receive the respective tip ends of a pair of electrode tips, and a through portion which runs through in a rotation axis direction and provides an opening that communicates with each of the recessed receivers. A cover case covers the lower recessed receiver of the rotary cutter and has a notch which is associated with the lower recessed receiver. Over the upper recessed receiver of the rotary cutter, a cover plate is fixed to cover the upper recessed receiver. An electrode tip insertion hole is cut through a center portion of the cover plate.

Methods and apparatus to clean and dry cavities are disclosed. A disclosed example tool apparatus includes an inner tube to provide a fluid to the cavity when the tool apparatus is positioned relative to the cavity, and an annular tube surrounding the inner tube, where the annular tube is fluidly coupled to a suction chamber and where the suction chamber is fluidly coupled to a vacuum vessel. The example tool apparatus also includes a valve disposed between the suction chamber and the vacuum vessel.

In one aspect of the disclosure, a system for processing a location of a workpiece is disclosed. The system includes a tool, including a first passage, configured to supply a vacuum to the location, and a second passage formed along the first passage, where the second passage is configured to supply a fluid to the location. The system also includes means for rotating and selectively axially vibrating the tool, means for supplying the fluid to the tool, and means for supplying the vacuum to the tool.

A hand-held power tool, in particular woodworking tool, including a housing, a handle for positioning the power tool relative to a workpiece, a reciprocating unit for holding a tool for machining a workpiece, a drive module located in the housing for driving the reciprocating unit, and a pressurized fluid dispensing assembly having an outlet area for dispensing gaseous pressurized fluid into a working area of the tool during machining of the workpiece with the tool to purge the working area to cause and/or assist a conveyance of workpiece particles from the formed depression.