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
