http://ams.com/eng/Products/Position-Sensors/Magnetic-Rotary-Position-Sensors/AS5040
You can buy demo boards from digikey and I think they have versions up to 14bit (?). 12 bit for sure. Also, they have ABI output (channel a, channel b, and index) as well as pwm and ssi. Hmm, ABI wouldn't work so well for absolute position, but the other outputs would. I think renishaw makes 'finished' versions of these. I ran across CUI, Inc on digikey and they have low cost capacitive encoders. Think mititoyu caliper. http://www.cui.com/product/components/encoders/absolute/modular/amt20-v-kit This one is spi: http://www.digikey.com/product-search/en/sensors-transducers/encoders/1966131?k=AMT20 Good luck. Mark From: andy pugh <bodge...@gmail.com> > Subject: Re: [Emc-users] [Emc-developers] using an absolute encoder > To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > Message-ID: > < > can1+yzwvq+o44dzmnwzhsfydrg9+8o8reshk-okz7wsu1db...@mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > On 21 January 2016 at 23:23, Stuart Stevenson <stus...@gmail.com> wrote: > > > I think a resolver would be the way to go. > > Possibly not enough resolution for a rotary table. > Something like the Heidenhain angle encoders might be better, they > turn up on eBay occasionally. > http://bicep.caltech.edu/~yuki/servo/208_736-27.pdf > > However the absolute ones appear to use EnDat, and I don't know if > there is any LinuxCNC support for that. > > Renishaw have some that use SSI (Or BiSS, I have forgotten which, but > something there is a Mesa driver for). > > If you could find a head for this... > > http://www.ebay.co.uk/itm/Renishaw-RESR-20um-Rotary-Optical-Angle-Encoder-Ring-52mm-8192-Line-Count-/161850920680?hash=item25af110ee8:g:gtcAAOSwT5tWGQ8E > > > -- ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
