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
