Gene Heskett wrote: > On Tuesday 21 August 2007, Jon Elson wrote: 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? :) > Hollow electrode? I get various bits of brass tubing at some electronic/hobby supply places, I think all the hobby shops have these racks of aluminum and brass materials (sheet, wire, tube, square tube, airfoil-shape and wire). > > 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... > You might try WD-40 or LPS 1, might be similar substance. > Q? Does distilled water carbon up like the hydrocarbons do when doing this? > Where would the carbon come from? And, that black stuff is probably not primarily carbon, but microscopic metal bits. > 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 think a modest filter right at the rectifier, before the resistor, is a good thing, but may not be necessary. When I got everything perfect (a rare occurance) I got a very high rate of discharges, like bacon sizzling, and very fast progress. Everything usually shorted out soon after due to the buildup of metal dust. > 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. With 100 mA, .0012 IPM is real good. If you can get a couple amps average, you should get .025 IPM. 3/4" at .025 IPM is 30 minutes! Not bad to get the tap out of the hole.
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