Abstract: An electric discharge machine with a turning or touch-up of the electrode uses an auxiliary tool for cutting or chiseling within an auxiliary tool holder which is mounted in the tank and includes a reference sphere for determining the electrode's shape. The auxiliary tool can include an assembly of several mechanical tools mounted symmetrically.

Abstract: A blind riveting system is disclosed having a rivet gun with a housing defining a fluid chamber. A piston is slidably mounted in the fluid chamber and is moveable between a forward and a retracted position. The piston divides the fluid chamber into a drive chamber and a return chamber. A first source of incompressible fluid is fluidly connected to the drive chamber while, similarly, a second source of incompressible fluid is fluidly connected with the return chamber. A trigger on the rivet gun is moveable between an actuated position and a release position. Upon movement of the trigger to its actuated position pressurized, and incompressible fluid is provided under pressure to the drive chamber which drives the piston towards the retracted position, and in doing so, fastens the blind rivet. Upon release of the trigger, pressurized incompressible fluid is provided to the return chamber to thereby return the piston to its forward position in preparation for a subsequent riveting operation.