Abstract: A dielectric cover is detachably coupled, in enveloping fashion, about the motor casing portion of an electric hand drill of pistol form with a front portion extending beyond the drill shaft projecting from the front end of the drill casing. The cover acts as a torque tube to support a right angle drive reduction gear mechanism which terminates in a drive wheel rotating about an axis perpendicular to the drill shaft axis and within a friction drive mechanism, completed by spring biased idler wheel pressing sidewise against the drive wheel. Metal blocks mounted to the cover connect to one side of a DC source and mount a wire guide for guiding a thin wire first electrode into contact with and between the drive wheel and the idler wheel. The wire electrode which is frictionally pulled from a spool borne by the cover feeds through a conductor tube of an electrode nozzle assembly. The conductor tube receives an inert shielding gas which flows about the thin wire first electrode and the arc.

Abstract: A dielectric cover is detachably coupled, in enveloping fashion, about the motor casing portion of an electric hand drill of pistol form with a front portion extending beyond the drill shaft projecting from the front end of the drill casing. The cover acts as a torque tube to support a right angle drive reduction gear mechanism which terminates in a drive wheel rotating about an axis perpendicular to the drill shaft axis and within a friction drive mechanism, completed by spring biased idler wheel pressing sidewise against the drive wheel. Metal blocks mounted to the cover connect to one side of a DC source and a mount wire guide for guiding a thin wire first electrode into contact with and between the drive wheel and the idler wheel. The wire electrode which is frictionally pulled from a spool borne by the cover feeds through a conductor tube of an electrode nozzle assembly. The conductor tube receives an inert shielding gas which flows about the thin wire first electrode and the arc.