Nicklas hello some notes in line... 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'. > see the attached picture. Almost white color is voltage in ADC units and > red is adaptive speed, machining is happening in the middle. You attached the circuit , not a trace of the process inputs and outputs. > I have no idea if this is normal or bad tuning. please use a real oscilloscope and monitor your circuits output and your cut's gap voltage ignore vertical scale and observe that shorts ( on the gap volatge) very quickly create an outfeed command ( on your circuit ) observe open (no load voltages) create an infeed command ( this explanation assumes positive tool, neagtive work piece, copper or graphite tool, and a pulse generator with on and off times , an rc generator look quite different ) you likely see opens and shorts but only brief sequences of cutting pulses and so are unable to achieve a 'steady' process from your description. I suggest that you observe the cutting on the oscilloscope: look for signals that look like chairs , like an old straight backed wooden chair these pulses are cutting, and inside a real cutting pulse is some information you need. On Sun, 19 Jun see http://nopr.niscair.res.in/bitstream/123456789/13597/1/IJEMS%2018%286%29%20411-415.pdf the important bit is the voltage level of the 'seat' IF you tune your circuit to track (servo) near this value THEN the process will stabilize in my experience its near 30Vdc for Cu or Gr to Steel so my circuits allow the user to choose the traget voltage (near 30 for the smart operators) and my circuit finds the ERROR of the real process to the chose target value That error is fed to drive the motors, When the system see no error, it does not request any motion But the error is based on the ideal, not 0 not 100Volts, but the _natural discharge value_ of the materials and dielectric in use! HTH tomp tjtr33 ( theres lots of explanations of this on the web the best i know was Hr. Schumacher ex- of AGie its been stolen and copied by most edm manufacturers in their books. once you see the original you can recognize all the bad copies ;-) its a series of the different stages of one spark the magnetic phase, the thermal phase, hydraulic phase,,, quite a good explanation without needing words. sorry i cant find a web copy right now nope 1/2 hr and no originals found, sorry oh this is pretty good http://edmtechman.com/about.cfm?pg=2&chap=2#a1 2016 07:19:59 +0700 TJoseph Powderly <tjt...@gmail.com> wrote: >> hahaha thats great Nicklas. >> the action at the gear tells me its real edm too! >> thanks >> tomp >> >> On 06/19/16 04:08, Nicklas Karlsson wrote: >>> I have real machine but coffecup is more handy during development and at >>> last I got my coffecup EDM up and running. >>> >>> https://youtu.be/fBOl_pCkDFA >>> >>> >>> Nicklas Karlsson >>> >>> ------------------------------------------------------------------------------ >>> What NetFlow Analyzer can do for you? 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Make informed decisions using capacity >> planning >> reports. http://sdm.link/zohomanageengine >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
