On Tuesday 21 August 2007, Jon Elson wrote: >Gene Heskett wrote: >> Understood. In playing tonight with 25 volts & probably 100 ma average, I >> found that spinning the electrode at around 1k rpms seemed to add enough >> agitation to the oil that I could use it all up and go about 30 thou >> before I had to vacuum it out and refresh it, with about 1/2 cc in a >> modeling clay dam around the hole. A 100 rpm spin would short in just a >> thou or two. > >That is way too low a current for any serious metal removal. >You want at least an amp, and it will still be really slow. You >need an insanely fine feed. I have .000025" per encoder count >on the Z axis of my mill, so I could get a pretty slow feed, >about .0001" every second. It still took all evening to burn >out one tap. I think with a hollow electrode with a drip feed >scheme through the electrode it would go a lot faster.
Theres always that 'yabut' Jon, in this case yabut where can I find one of those? :) >The alum-tap is a really light fluid, maybe just a little higher >viscosity that water. It worked MUCH better than #20 oil, which >I also tried. Try a couple different fluids to see what works >best, it makes a big difference. I have some other stuff too besides the fuel oil (#1 I think), paint thinners etc could be tried too. Aluma-tap would be a foreign language here in WV unless I ordered it from someplace I suspect... Q? Does distilled water carbon up like the hydrocarbons do when doing this? I ordered a pair of those transformers I posted the link to a bit ago, so I can go as high as 6 amps short circuit with around 77 volts peak open circuit. But I can't find any suitable electro's for filtering though. Other than making the sizzle buzz a bit, is upstream filtering of any advantage? My discharge cap is a 10 uf, 1.5kv rated square can, presumably oil filled. Even at this voltage, if exposed it will spit sparklers 2". I was having emc lower the electrode at about .0012"/min. Steppers, had to look very close to see it moving at all. My z divider is 16,000, a wee bit coarser than yours, but the real speeds are similar. Thanks. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Yo-yo operating system = WinNT: it goes up..., it goes down..., it goes... -- From a Slashdot.org post ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
