Originally Posted by MrWild  you say flutes, but you mean rifling i'm assuming. The flutes get a twist, am I right? If so, you need a free wheeling swivle head, and a lead. The swivel head is allowed to swivel/spin (of course) as the ram extends downward. A lead (maybe not the right term) is above the bore and gives the electrode the twist you need as it goes down into the bore. The lead needs to be longer than your riflings, and the electrode should have all your flutes.
Basically you need the same set up more or less as if you were machining threads. The difference is that the ram floats as the head spins for threads, but for this you will want the head to float (free wheel) as the ram sinks. The lead causes the head to spin or twist giving the rifling. Total PITA and will take several electrodes to accomplish. Have you thought about broaching the rifling instead? |
the fluting i require done is different to rifleing, the barrels are alredy rifled and chambers cut. these barrels are specific to the Heckler and Koch rifles in that they have 12 horizontal flutes cut into the chamber (where the shell sits) to facilitate in cycling the weapon. without these flutes the rifle would fir once and not cycle.
if you look at the pic i posted you can see the flutes in the chamber. the factory EDM's them in i know this for a fact. all of the other barrel MFG's out there broach cut the flutes.
i had thought about doing them one at a time but i wanted to see if there was any way to do them all at once. i may just have to do it that way, or at least tell the shop im going to try to get to do it that.
thanks guys!!!