Nicklas regarding 'start of period to count' there is a concept in EDM that was branded ISOpuls and more genericly iso-energetic
it is a method concerning WHEN to begin the on-time count. to make each spark have same energy the duration of current flow must be equal so a circuit to detect the drop from OpenVoltage to DischargeVolatge is used to trigger the timer for on time. refer to the previous pdf to see when the 'back of the chair' falls to the 'seat of the chair' that is when the current begins to flow IF there is no back to the chair, there is a problem the oil is too conductive ( too thin[shorted/too close] or too dirty or too conductive ) IF there is no seat to the chair, there is NO vconduction and you are too far or the oil is too resistive tap water, de-ionized water, thin automotive oil (0-5-10W) and kerosene all work fine i used peanut oil once for a medical application where the fda claimed the oil based fluid contaminated the recast layer. you do use a fairly open voltage (60-80V=) so that will make the oil quality more important if you refer to the previous pdf files you will see the researchers BEGIN counting on-time when the voltage drops can you see any sparks? 10 ma at 150 was used in AGie L series generator for a decade, so you are not far off you can see sparks and hear what Dave Engvall talks about in this https://videobin.org/+8ku/bfq.html the white line below oil is sparks, not bubbles you could try kerosene ( easy to get, stinks and is flammable, tho i use it without fear ) i do not understand the 'spark extinguishing voltage' could you say this another way? the ratio of ignitions to attempts to ignite can be a measure of efficiency ( and an indication of the correctness and stability of the edm servo tracking ) regards TomP On 06/25/16 15:37, Nicklas Karlsson wrote: > I investigated further and it seems to matter at which voltage level start of > period start to count. As is now current is on during wait for ignition and > hence this period may be elongenated with a lover voltage level. Low enough > and on time will not start until a sparc happen. > > I actually think either ignition current of 10mA is to low or resistance in > EDM fluid is to low. > > I should finnish of the protocol before running more: > 1. Off and on times. Sparc extinguishing voltage. Start of period voltage. > 2. Measure current and voltage. Count number of sparc and ionization > events. > > > Regards Nicklas Karlsson > > > > On Fri, 24 Jun 2016 18:15:03 -0700 > dengvall <[email protected]> wrote: > >> I've not played with EDM for quite a while. > 10 years so I've >> forgotten most of what I knew. >> I know of people that used hardware store lantern oil as EDM fluid. If >> it sounds like frying bacon >> you are in the right range. >> Sounds (npi) like fun. :-) >> >> Dave >> >> On 06/19/2016 10:07 AM, Nicklas Karlsson wrote: >>>> On 06/19/16 17:55, Nicklas Karlsson wrote: >>>>> I tried to tune parameters manually but most of the time is spent either >>>>> in short circuit or open circuit, >>>> this is called 'hammering' >>>> it actually works but for a poor reason. >>>> if the tools is too far away, you are open >>>> if the tool is too close, it is shorting >>>> For a brief time in transit between these 2 states you DO achieve the >>>> proper position >>>> and you get _some_ sparks. >>>> >>>> the idea is to find the ideal position where sparks occur easily >>>> yiu can find this if you can control the 'edm servo'. >>> Then I now how it should look. I didn't expect something good with my Lego >>> prototype without proper tuning and to low ignition voltage at the first >>> run. >>> >>>> ... >>> You provided exactly the information I needed, thanks! >>> >>> >>> Regards Nicklas Karlsson >>> >>> >>> ------------------------------------------------------------------------------ >>> What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic >>> patterns at an interface-level. Reveals which users, apps, and protocols are >>> consuming the most bandwidth. Provides multi-vendor support for NetFlow, >>> J-Flow, sFlow and other flows. Make informed decisions using capacity >>> planning >>> reports. http://sdm.link/zohomanageengine >>> >>> >>> _______________________________________________ >>> Emc-users mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/emc-users >> ------------------------------------------------------------------------------ >> 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 >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ > 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
