interesting. Chris found this - this is pretty close to the time frame of our machine. probably an eb (one newer iirc) http://www.google.com/patents?id=fhRaAAAAEBAJ&printsec=abstract&zoom=4&source=gbs_overview_r&cad=0#v=onepage&q&f=false sam
Jan de Kruyf wrote: > Hello, > Unless I am very wrong this patent is a non-flyer. > The old G-E systems had a discriminator that measured the difference > in phase between the command pulse train and the feed-back pulse > train, and the output of the discriminator was the input to the drive > amplifier. > So how on earth you can insert a random pulse in the command pulse > stream evades me completely. You would just upset the discriminator > output and it would have little effect on the actual motion of the > machine. > And at worse you would lose sync all together like indeed in a stepper setup. > > Jan > > > On Fri, Apr 16, 2010 at 8:00 PM, sam sokolik <sa...@empirescreen.com> wrote: > >> the main thing is that it is already on the machine... To replace them >> with something new would require a total disassemble of the saddle and >> table.. We will be using the encoders on the servos for position >> initially - the scales will be more of an experiment... ;) >> >> We just found this... >> http://www.google.com/patents?id=NqpNAAAAEBAJ&printsec=drawing&zoom=4#v=onepage&q&f=false >> >> Gives a better block diagram... (it is a patent to add temp comp to the >> circuit...) >> >> sam >> >> On 4/16/2010 12:50 PM, Jon Elson wrote: >> >>> Andy Pugh wrote: >>> >>> >>>> However, I think just applying a 250Hz square wave and an oscilloscope >>>> should at least tell you what comes out of the terminals and then you >>>> can figure it out from there. A $15 Arduino with a power OP amp can >>>> produce the excitation, sample the output, time it to 62nS resolution >>>> and convert it to encoder-style pulses. >>>> >>>> >>>> >>>> >>> The drive excitation has to be VERY carefully balanced, as the output >>> signal is MUCH smaller than the drive. >>> Other than that, yes, you could probably build a modern circuit with >>> good micro or FPGA to do all the counting, etc. >>> Not completely sure it is worth it. >>> >>> Jon >>> >>> ------------------------------------------------------------------------------ >>> Download Intel® Parallel Studio Eval >>> Try the new software tools for yourself. Speed compiling, find bugs >>> proactively, and fine-tune applications for parallel performance. >>> See why Intel Parallel Studio got high marks during beta. >>> http://p.sf.net/sfu/intel-sw-dev >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >>> >>> >> ------------------------------------------------------------------------------ >> Download Intel® Parallel Studio Eval >> Try the new software tools for yourself. Speed compiling, find bugs >> proactively, and fine-tune applications for parallel performance. >> See why Intel Parallel Studio got high marks during beta. >> http://p.sf.net/sfu/intel-sw-dev >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.437 / Virus Database: 271.1.1/2814 - Release Date: 04/16/10 > 06:31:00 > > ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
