On Wednesday 20 July 2016 22:34:00 TJoseph Powderly wrote: > Hello Gene > Using copper tools to cut steel ( all other variable untouched ) > Positive tool is lower wear & slower cut & rougher finish > Negative tool is higher wear & faster cut & finer finish > hth > tomp > tjtr33
No copper flashing handy, so I used a thin sheet of brass. I made an arbor to hold a disk, then cut out a 3" disk which I ran against a skate wheel bearing hard on the down face, enough to bend it slightly, then followed the demag procedure and lifted it back off the bearing slowly so it would stop bending at the point where it ran dead true. But the 1/8" center hole and a 3mm0.5 retainer screw were off center just enough it took an hour to burn the edge concentric, but once that was done I could, for shade tree edm, march it right along at about 30 minutes a slot. Burn current about 1/2 amp average. I had glued with some si glue, a nut to the far end so I could lay it down on the flat, but the GO2 wasn't fully set, so the K2 screwed the adhesion enough the nut fell off just now. I have one more slot to cut, so I'll see if any of my superglue is usable tomorrow. In resuscitating my previously built edm power supply, I found I'd put a dpdt switch so I could reverse it, but the way I hooked it up, the dvm said I had + on the workpiece. It seemed to work ok considering the voltage was only in the 30 something range. That would match up with your - on the tool. Thanks Tomp. > http://connection.ebscohost.com/c/articles/66135144/effect-tool-polari >ty-machining-characteristics-electric-discharge-machining-silver-steel- >statistical-modelling-process I bookmarked this one. good discussion. 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
