On Sunday 11 April 2010, sam sokolik wrote: >I have started looking at the scales that came with the mill we are >working on - I had figured that the where some version of a linear >resolver... bit it isn't 1 coil in - 2 out for sin/cos. The way I >understand it - the send a 250hz square wave to the outside of each >coil. the 2 centertaps are summed together to get the position. (I >assume the output of the centertap is the reletive postion comparing it >to the input square wave. I was thinking that maybe something like JonE >resolver to quadature converter would work - but I am not sure now... >We could always resorect the old circuits.. :) but I would rather not. > >each of the 4 coils measure 114ohms > >This is the circuit that sent the square wave to the head and summed the >centertaps. >http://electronicsam.com/images/KandT/conversion/accupinscirc.jpg
This isn't clear enough to be of much help to me. > >this is what the head reads... >http://electronicsam.com/images/KandT/conversion/accupins.JPG Interesting, Sam. I wonder if the electronics tied to those 4 coils might be related to a primitive 4-quadrant multiplier? That may well output a pair of sine waves as it moves, at 90 degree phase angles, sine and cosine if you will, and the resolution with suitable math could be sub-micron. I'm sure there are more modern, more accurate chips available today. We used the lm1495 (I recall it was an lm, could have been an mc1495 too) at frequencies into the high audio range for one input, and 10.24Mhz as the carrier for ssb mod/demods in ssb cow barn radios in the 70's. Genuine hi fidelity compared to most of the crap being sold to Joe Trucker at the time. >thanks again >sam > > > > > > > > >--------------------------------------------------------------------------- >--- 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 >[email protected] >https://lists.sourceforge.net/lists/listinfo/emc-users > -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Where's the man could ease a heart like a satin gown? -- Dorothy Parker, "The Satin Dress" ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
