Greetings everybody; The next step in making this shaft extension will be slitting the socket so that a tapered nut matching the tapered threads can compress the resulting fingered socket.
I did this once before using the larger of the dremel diamond disks, but was not at all happy with the slitting because there's no way to make it spin dead true on that poorly made quick change mount. And due to wear of the diamonds, it eventually starts pinching the disk badly enough that the dremel can stall. So I am thinking of other ways to do this. One way would be to make a brass disk, say 3" in diameter with a hole in the center, and an arbor to mount it, then bury it in a container of k2 sitting on the toy mills table, container big enough to hold this shaft, perhaps with a hex nut glued to the other end in order to supply a reference flat for the angle separation of the slots. The disk being spun at a low rpm so that it is carrying away the edm debris and refreshing the k2 in the working gap. Has anyone any experience at rigging up such a contraption? And do we have a module that can modulate the x feed, including a reversal in the event of a short, unlikely with a rotating disk as the sacrificial tool I think, but something that would attempt to maintain a consistent average gap voltage by making the x feedrate variable? Not haveing had that in my previous EDM adventures, its always been just use a slow enough feed that there may not be any sparks at all for a few seconds as its using the maximum voltage the supply can muster. Perhaps an offset module in the x stepper path? I could probably cobble something together but "calibrating" it might take the fun out of it. But from discussions I have read, the lower voltage, higher frequency spark results in a finer finish and a faster rate of cutting. So that would seem to be desirable. For simplicity the spark source will be RC. At about 39 volts, enough R to keep the short circuit current at about 2 amps, and if I can find it, a 1uf mylar capacitor. The last time I did this, I was boreing holes in a 10" table saw blade to mount it on my rotary table so I could sharpen it. And I used about 75 volts with a 10 uf oiled paper capacitor, huge sparks, noisy enough I put on some shooting earmuffs, and drilled a flawless 6mm hole thru 95 thou of chrome plated hard steel in about 4 minutes a hole. Any gotcha's I should watch for from those of you with possibly similar experience? Thanks. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports.http://sdm.link/zohodev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
