50A/in^2 very crude rule fro Gr/St ( graphite to steel ) the 'current density' is NOT linear maximum is near 400amperes even if area is yds^2 becasue the process is not controllable at extreme currents and is seemingly high at very low areas 50 amps supplied to 1mm dia bras tube and 12 amps 'draw' seen on meter
and that rule is only for roughing ( creating net form ) not for finishing during roughing the 'frontal area (Fp) is the governing factor in finishing, the Peak to valley of the craters is the governing factor for engraving graphite or copper is commonly used the choice is oftern determined by experience experience of... do i want a dirty shop and cheap electrodes ( graphite) or a clean shop and expensive electrodes ( copper) hth tomp On 03/03/2016 01:38 PM, Gene Heskett wrote: > One thing I have always felt needed to be asked, but don't recall > seeing it discussed, is when doing a sinker edm to imprint a carbon > mold like I've seen pix of, like engraving a relieved signature, is > there an optimum current per square, either in cm2 or in2 to design > the process to so it functions best? And in terms of wear on the > shaped carbon electrode, is there a best current per square in terms > of the metal removed vs the carbon wasted that will prolong the > electrode life vs metal removed? I've seen other processes where > optimizing one is not optimizing the other. Or is there a better > material to make the electrode from? ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
