Abstract: A method and apparatus for clamping an electrode tube in an EDM drill equipment is incorporated with an elastic seal and a collet. The method providing an insert having a through hole disposed at the center to concentrically accommodate and restrict the elastic seal, placing the insert into the collet, and inserting the electrode tube in the insert and the elastic seal, tightening the nut to the spindle to clamp the electrode tube and passing the EDM machining current from the spindle to electrode tube. The apparatus includes an insert having a retaining ring to restrict an elastic seal, a through hole to admit insertion by the electrode tube. The insert of the above method and apparatus comprises a guiding pipe to be secured in the collet, and a tapered guide hole interconnecting with the through hole to facilitate insertion of the electrode tube. Optional slots are provided at the lower portion of the guiding pipe.

Abstract: An EDM drill comprised of an automated electrode tube replacing means to allow fully automated and continuous working on holes; and further comprised of an electrode tube guide selection device to allow fully automated and continuous working on holes of various diameters.

Abstract: An EDM drill is provided which includes an automated electrode tube replacing mechanism for fully automated and continuous operation. The EDM drill further includes an electrode tube guide selection device to allow the fully automated and continuous operation on holes of various diameters.

Abstract: An EDM drill comprised of an automated electrode tube replacing means to allow fully automated and continuous working on holes; and further comprised of an electrode tube guide selection device to allow fully automated and continuous working on holes of various diameters.

Abstract: An EDM drill comprised of an automated electrode tube replacing means to allow fully automated and continuous working on holes; and further comprised of an electrode tube guide selection device to allow fully automated and continuous working on holes of various diameters.

Abstract: A power supply for electro-erosion machine includes a capacitive network in series connected in the current loop for limiting or controlling the current flow through the gap formed by electrode and work-piece a switching device is adapted to change the direction of charging and discharging current of the capacitive network, a driving circuit (firing circuit) is adapted to drive the switching device on and off so as to control current flow through the capacitive network. This lower resistance circuit eliminates huge power loss and reduces switching stress of the switching device. The electro-erosion ON-OFF time signal and the current-pattern control along with the circuit, constitutes a compact, low electrode wear and low electromagnetic noise electro-erosion machine power supply.

Abstract: A power supply for electro-erosion machine comprises a capacitive network in series connected in the current loop for limiting or controlling the current flow through the gap formed by electrode and work-piece, a switching device is adapted to change the direction of charging/discharging current of the capacitive network, a driving circuit (firing circuit) is adapted to drive the switching device on and off so as to control current flow through the capacitive network. This lower resistance circuit eliminates huge power loss and reduces switching stress of the switching device. The electro-erosion ON-OFF time signal and the current-pattern control along with the circuit, constitutes a compact, low electrode wear and low electromagnetic noise electro-erosion machine power supply.