On Monday 20 August 2007, Dave Engvall wrote: >Hi Gene, > >Paraffin oil aka lamp oil is pretty close to EDM dielectric.
How about fuel oil, as in what you'd feed one of those horizontal tank heaters? It seems as usable as anything else & I've got 5 gallons of it getting old, cuz I fired it up in the shop one night several years ago and everything in the shop turned bright red with rust in about 15 minutes. I had no idea they put out that much steam/water vapor... Obviously never lit it again. >Using >70 -90 V for your DC supply and something on the order of 10 uf >with a resistor in the 20-50 ohm range should get you an RC circuit >that will be close. A bit if component substitution will get you to >an acceptable combination. With 25 volts, & 10 uf, lets just say that progress has to be measured with a micrometer, daily. I managed about 0.110" deep today. >The electrode really doesn't have to >rotate, just pick one a bit larger >than the core of your tap; erode out the center and tip the outside >pieces in. It works like a charm. >The higher voltage will make the gap adjustment much less critical. I'm looking for a suitable transformer right now. How about a pair of these at herbach? <http://www.herbach.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=HAR&Product_Code=TM95XFR2765&Category_Code=XFR> With the secondaries in series aiding, that ought to be enough, using one 50 ohm 200 watt limiter R. Also, tonight I found that if the electrode spins at approx 1k rpms, it seems to stir the oil a lot better & it doesn't descend to a short circuit nearly so easily. I could got 30 to 40 thou on an "oil change", with about half a cc trapped in the modeling clay dam, which the oil dissolved eventually. >HTH > Muchly, thanks. >Dave -- 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) Penn's aunts made great apple pies at low prices. No one else in town could compete with the pie rates of Penn's aunts. ------------------------------------------------------------------------- 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
