mechanics of porting a barrel

pavil58

May 03, 2002 17:59

When a barrel for a weapon is ported,say a revolver, how is the bore cleaned up? I would imagine that by drilling the holes burrs would be left behind, within the bore. Is the operation performed before the rifling is done or maybe the bore backbored to where the ports are? Thanks!

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  gruntled

  May 03, 2002 19:26

  I believe the most common way is EDM (Electronic discharge machining)
  rather than drilling. This does not leave a burr on the inside of the bore.

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  drawn

  May 03, 2002 21:57

  Mag-na-porting is accomplished with Electrical Discharge Machining (EDM), a surgically precise method of removing metal. Dielectric oil is flooded over the area of the barrel that is to be "cut," and an electrode. When voltage is applied, the oil is ionized, which establishes a continuous flow of electrons between the electrodes and the barrel...an electrical arc. It is the electron flow which does actual "machining" of the trapezoidal ports.
  
  The patented Mag-na-port process assures the gun owner of a smooth incision of exact dimension. There is no damage to the metal surrounding the ports; no machining marks, as would be the case subsequent to a drilling operation. The finish is similarly protected, as it is blended into the metal exposed by the erosion process during the EDM operation.

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