System and method for drilling a hole for a countersink fastener

A drilling apparatus for forming countersunk holes, the drilling apparatus comprising:

• a drill motor housing assembly having an inlet air duct;
• a rotor/spindle assembly having a first duct formed through an axis about which the rotor/spindle assembly rotates within at least a portion of the drill motor housing assembly, wherein the inlet air duct is fluidly coupled with the first duct;
• a countersink cage connected to the rotor/spindle assembly and having a second duct formed through an axis of the countersink cage and aligned with the first duct of the rotor spindle assembly, such that air forced through the first duct flows into the second duct;
• and
• a countersink cutter having a first end and a second end opposite the first end, wherein the countersink cutter is connected to and housed at least partially in the countersink cage at the first end and has a plurality of flutes formed into the second end, wherein the countersink cutter has a third duct formed along at least part of an axis of the countersink cutter, wherein the countersink cutter has a plurality of exit ducts fluidly coupled with the third duct and the plurality of exit ducts each terminates at an opening within one of the plurality of flutes of the countersink cutter, wherein the rotor/spindle assembly comprises a rotor assembly operable to rotate via compressed air and a spindle, wherein the first duct extends through both the rotor assembly and the spindle of the rotor/spindle assembly.