hmm nicklas, its a oneshot not a multivibrator for isopuls. its a retriggerable if _not_ isopuls
make sense? yes a hi-rez timer could be used for one shot, but needs voltage drop detector to trigger it tomp On 03/09/2016 03:07 PM, Nicklas Karlsson wrote: > The high resolution timer together with the comparators should be able to do > exactly what you say if properly configured. I got square wave out yesterday > and expect to spend a few hours before it's correctly configured for EDM. > > These micro controllers have only been available for a few years at most, > they are really good and available from maybe a few dollars each. > > Regards Nicklas Karlsson > > > On Wed, 9 Mar 2016 14:10:03 +0800 > TJoseph Powderly <[email protected]> wrote: > >> Niklas Pete, >> if you want ISOPULS ( isoenergetic pulses that have uniform craters ) >> then all the worry about frequency is useless >> >> if you dont need uniforn surface finish, then ignore this comment >> >> if you DO want uniform surface finish, then you do not use repetitive >> pulse grnerator >> instead, you wait for ionization ( a kind of indetermonate latency of >> conduction) >> THEN start decrementing the ontime. This was the joules delivered are >> equal ( the energy is equal ) >> Once the ontime is finished, the current is turned off and the off time >> is waited >> THEN you turn on a tiny exciting voltage and wait for another ionization >> ( and voltage drop ) before starting the next ontime current flow. >> >> some pix: >> http://www.edm-products.com/Dielectrics/ifase/ifase_1.htm >> look at figure 3 >> if you wait for the ionization (wait for the voltage to drop) >> and then deliver current for the duraction of 'ontime', >> the energy delivered will be uniform, and the surface crater will be uniform >> if not, the energy per pulse in non-uniform, to the extreme that some >> pulses deliver nearly no energy! >> see figure 4, >> when the strategy is isoenergetic, the current waveform will be uniform >> and the leading edge of the voltage will vary. >> if not isoenergetic, the leading edge is static on the scope, >> but the current wave form will vary. >> >> On 03/09/2016 01:59 AM, Nicklas Karlsson wrote: >>> A microcontroller with suitable peripherals for power conversion is cheap >>> and do the work much better. I know about: stm32f334, Infineon xmc4xxx >>> something, maybe texas instruments and Microchip. >>> >>> I am working with stm32f334. It have a high resolution timer equal to about >>> 4GHz clock frequency with a lot of triggering options, DAC, fast >>> comparators and cost maybe a few dollars. There are also cheap development >>> boards available. >>> >>> I guess spindle off/on signal may be useful to turn off/on generator and >>> some m-code is useful for the parameters? >>> >>> Regards Nicklas Karlsson >>> >>> >>> >>> On Tue, 8 Mar 2016 16:47:42 +0000 (UTC) >>> Pete_Gruendeman <[email protected]> wrote: >>> >>>> Hi Nicklas: >>>> I am writing with a request for what might be speculation on your >>>> part. Given what others have said about pulse frequency, and what is >>>> written in the Poco tech manuals (frequencies of approximately 8.33- >>>> 50kHz, derived from varying on and off times), would it be reasonable to >>>> produce the pulse timing from and at the same time that the PC is >>>> directing motion control? Erosion pulse generation could be treated as >>>> another axis-- maybe? I am concerned that the standard parport provides >>>> rather coarse granularity (increments) between one size and another size >>>> of pulse, especially as the pulse durations get down to 10 micro seconds >>>> on a finishing burn. The Mesa 5i20 will create about 200kHz pulses with >>>> L-cnc input and maybe one of the two parports on it could be repurposed as >>>> a pulse generator? Maybe it's unrealistic to generate pulses from the >>>> motion control PC because computing power isn't sufficient? Your >>>> thoughts? >>>> >>>> Pete Gruendeman >>>> >>>> -------------------------------------------- >>>> On Sun, 3/6/16, Nicklas Karlsson <[email protected]> wrote: >>>> >>>> Subject: Re: [Emc-developers] EDM gap control (Control parameters) >>>> To: "EMC developers" <[email protected]> >>>> Date: Sunday, March 6, 2016, 10:22 PM >>>> >>>> On Mon, 7 Mar 2016 >>>> 10:23:31 +0800 >>>> TJoseph Powderly <[email protected]> >>>> wrote: >>>> >>>> > off time is >>>> really dpendant on flushing conditions >>>> > >>>> on time causes rougher finer surface finish >>>> >>>> I guess this explain it all >>>> and it also make perfect sense. More powder behind remove >>>> more material and longer time in between leave more time for >>>> debri to remove debri. >>>> >>>> >>>> Regards Nicklas Karlsson >>>> >>>> >>>> ------------------------------------------------------------------------------ >>>> Transform Data into Opportunity. >>>> Accelerate data analysis in your applications >>>> with >>>> Intel Data Analytics Acceleration >>>> Library. >>>> Click to learn more. >>>> http://makebettercode.com/inteldaal-eval >>>> _______________________________________________ >>>> Emc-developers mailing list >>>> [email protected] >>>> https://lists.sourceforge.net/lists/listinfo/emc-developers >>>> >>>> >>>> ------------------------------------------------------------------------------ >>>> Transform Data into Opportunity. >>>> Accelerate data analysis in your applications with >>>> Intel Data Analytics Acceleration Library. >>>> Click to learn more. >>>> http://makebettercode.com/inteldaal-eval >>>> _______________________________________________ >>>> Emc-developers mailing list >>>> [email protected] >>>> https://lists.sourceforge.net/lists/listinfo/emc-developers >>> ------------------------------------------------------------------------------ >>> Transform Data into Opportunity. >>> Accelerate data analysis in your applications with >>> Intel Data Analytics Acceleration Library. >>> Click to learn more. >>> http://makebettercode.com/inteldaal-eval >>> _______________________________________________ >>> Emc-developers mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/emc-developers >> >> >> ------------------------------------------------------------------------------ >> Transform Data into Opportunity. >> Accelerate data analysis in your applications with >> Intel Data Analytics Acceleration Library. >> Click to learn more. >> http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140 >> _______________________________________________ >> Emc-developers mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-developers > ------------------------------------------------------------------------------ > Transform Data into Opportunity. > Accelerate data analysis in your applications with > Intel Data Analytics Acceleration Library. > Click to learn more. > http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140 > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers ------------------------------------------------------------------------------ Transform Data into Opportunity. 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