hi nicklas some dielectric info http://www.guiacnc.com.br/maquinas-em-geral/eletroerosao-caseira/?action=dlattach;attach=30033
basically the gap distance is goverened by the fluids 'dielectric breakdown strength' a measure of the distance at which a given voltage will allow a 'spark' to jump the gap BP ( british petroleum used to have a wonderful book on this but i cannot find a web link to the 100+ page large format booklet the formula is only distance and voltage, current does no matter the distance is in practice < 0.3mm ( practice says the open voltage is 300Vdc or less ) the clarity of the oil DOES affect the conducting quality if filthy, it conducts at 20mm! if dead clean, NO DIRT AT ALL, you will get hammering cuts ( read you need SOME dirt, not enought to see, but SOME particulate matter ) this is because the 1st phase of the s[park is MAGNETIC, where the field between the anode and cathode builds up and attracts dirt to form the bridge that the current crosses and which you see FLASH ) kerosene for heaters works well teeny hair sized tools use brownian motion in a drop of oil to flush matchstick sized tools need light flow ( dribble ) and likely intermittent cutting (like peck drilling ) large tools ( like transmission cases ) benefit from flush holes thru electrode to a pressurized supply line, the outflow is not intense, but a good rainfall. flushing is an art, well at least a craft/skill but for you, simply flowing nearby with generous off time (D% < 30%) should work was there a video of the cut? buildup on end of tool is swarf ~welded back onto tool. flushing, jumping, and low duty cycles will help ? try advancing to workpiece at 1um steps till discharge occurs then wait till discharges dissappear ( even when you thump the table ) THEN advance 1um till you spark again tomp tjtr33 ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
