Nicklashello the time from voltage turn-on until the voltage dropis the ionization time this can be used as an indication of the gap 'clean'.
the idea is that IF the gap is very clean , and constantly clean, each ignition delay time measured will be uniform and will be a 'standard' value for comparison. as the cut progresses and more debris is generated, this time measure will change and decrease because the debris will reducethedielectric quality (the anti-conducting quality). ( we taught users that the dirt was like stepping stones for the lighting bolt of the spark ) IF the time is too small, then the gap is dimensionally too small ( too close ) or too dirty ( needs 'peck' cycle ) or more fluid flow ( sweep up the dirt ) or more offtime or a combination of these this ionization monitor cause & effect loop should be faster than 100mS you cant change flow rates that quickly but you can add offtime to subsequent pulses other strategies are in scientific papers re: The sparc counter not sure what the count deal with yet it sounds like you could get a number related to (sparcs_attempted / sparcs_actual) = sparc_efficiency and then see if adjusting edm servo target voltage or offtime would increae that ratio adaptive control in edm is a great idea BUT make sure the adaptive control can be turned off! many times in AGie and Elox and Mitsubishi cutting, we found that turning the autopilots off was neccesary ( let ME drive the damn thing!) research often calls these devices 'pulse discriminators' <<<--- google that for more http://reza.hoseinnezhad.com/papers/Kotler_MST_preprint.pdf there was a good one by Prof Rajurkar at Univ Nebraska but i cant find it we built one with FORTH NMIS boards, and our Taiwan machines used a tiny PEEL and a PIC microcontroller to measure ionization time of course there were resistor dividers to reduce the 100+Volts and a diode bridge to make sure the polarity sampled was correct then some unity gain OPs then level sensing ladder to sort out digital info about Volatge level at what time during the attempted pulse some was too fast for the PIC so the logic of the PEEL was needed tomp tjtr33 On 01/06/17 04:41, Nicklas Karlsson wrote: > I am thinking about the ionization and sparc counters. These counters might > be useful to calculate how well the process work and maybe adjust parameters? > > On Mon, 2 Jan 2017 23:53:55 +0700 > TJoseph Powderly <tjt...@gmail.com> wrote: > >> Hello >> video of early iteration of edm panel in use >> https://videobin.org/+fe8/jab.html >> i think an example of reading the db file needs to be done soon >> but a working model is better than just thinkin' >> thanks >> tomp tjtr33 >> >> >> >> ------------------------------------------------------------------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, SlashDot.org! http://sdm.link/slashdot >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
