Scott, thats great! Your machine will have some response-ability meaning it just wont react to a sine above a certain frequency
at some point the control signal is saying up/down so fast the machine tool is just quivering, not getting to the commanded position. this is often a basic evaluation of an edm machine you wont really find machine that reacts to sines much > 400hz outside of labs so your results are super! try feeding a tiny positional sine to the X&Y while sinking you'll be orbiting :) i gotta come up to madison ? and see this regards TomP On Sun, Apr 15, 2012 at 1:49 PM, Scott Hasse <scott.ha...@gmail.com> wrote: > Definitely an interesting idea. To answer Thomas' question from earlier, I > was able to read a 500-1000 Hz range reliably enough to successfully > control EDM plunge/retreat for successful EDM on our first try using the > simple conditional gcode I referenced on the wiki page describing this. > > A lot more refinement is necessary, and I still have questions/further > investigations about why the frequency limit is so low, and additional > encountered some of the same sort of instability that Gene is encountering > in his encoder readings (even at a stable frequency input), but have not > filtered it as of yet using the component referenced in that thread. I'm > not sure an EDM system would really benefit from it anyway, as fast > response is more important than a stable reading, and there is no > mechanical momentum as their is on a lathe spindle. > > Scott > > On Sun, Apr 15, 2012 at 1:34 PM, andy pugh <bodge...@gmail.com> wrote: > >> On 9 March 2012 03:46, Scott Hasse <scott.ha...@gmail.com> wrote: >> >> > My question is about this analog input. >> >> One way to do this that I keep meaning to experiment with is to use a >> PWM output to create a reference voltage, and a comparator to detect >> whether it is above or below the voltage to be measured. >> >> A custom HAL component would be needed to ramp up/down the PWM value >> to track the measured voltage. >> >> -- >> atp >> The idea that there is no such thing as objective truth is, quite simply, >> wrong. >> >> >> ------------------------------------------------------------------------------ >> For Developers, A Lot Can Happen In A Second. >> Boundary is the first to Know...and Tell You. >> Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! >> http://p.sf.net/sfu/Boundary-d2dvs2 >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > ------------------------------------------------------------------------------ > For Developers, A Lot Can Happen In A Second. > Boundary is the first to Know...and Tell You. > Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! > http://p.sf.net/sfu/Boundary-d2dvs2 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
