We have a machine that has accupins.. (.1 diam pins in a row) sort of a linear resolver ( http://www.electronicsam.com/images/KandT/conversion/accupins.JPG). When we get this thing converted using encoders on the servos - we want play with them. We found this chip http://www.analog.com/UploadedFiles/Data_Sheets/460727771AD2S1200_0.pdf that converts resolver -> quadature. I think it is fixed at 1024 ppr with an index. So with a board including this chip - you could just hook it into the input for the encoder counter. http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=2556768;keywords=AD2S1200
sam ----- Original Message ----- From: "Stuart Stevenson" <[EMAIL PROTECTED]> To: "EMC2-Users-List" <Emc-users@lists.sourceforge.net> Sent: Saturday, February 09, 2008 8:30 AM Subject: [Emc-users] ADC > Gentlemen, > Jon, I don't know the level of demand for a resolver board. Would > this be a ppmc card or a separate module? I would like to have the > option in the ppmc set. If the price isn't too high I would buy five > to start. > There are still quite a few machines in service that have resolvers. > All the early Fadals have resolvers. I am not sure when they went > to pulse encoders. Both of ours have resolvers. Our newest one was > purchased in 1998. > The older Cincinatti 5 axis machines have resolvers. > I am sure as time passes the resolver demand will continue to > dwindle unless there is some overriding advantage to using resolvers > and the use is facilitated. In what application would a resolver be > the preferred choice? Why? > I have heard price is the reason people have switched to pulse > encoders. Unless alzheimer's has prevailed I remember the price of > pulse encoders is around US $150.00/$200.00. and the price of > resolvers for our Fadals is US $150.00/$200.00. Doesn't seem to be > much difference. > Maybe the reason everyone uses digital is there is no good/cheap > way to get the analog signal into the current controls? > This is definitely beyond my expertise but my perception of the > comparison between digital and analog is something like this. > With digital, the signals do not deteriorate until they just don't > work anymore. There is no adjustment necessary (or even possible). > With analog, as the individual components deteriorate the signals > need to be adjusted. Sometimes, this gets to be quite frequent and/or > involved. > Therefore, the initial cost be equal, the maintenance and repair > of digital is cheaper and easier than analog. > What about pressure/temperature transducers? Would a resolver > board also be able to connect to these and allow the use of their > feedback? Maybe with another pin selection? > thanks > Stuart > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > 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 Free Edition. > Version: 7.5.516 / Virus Database: 269.19.21/1266 - Release Date: 2/8/2008 > 10:06 AM > > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
