Hi I have 3 questions. First if to make motor work on very low feed 0.001 per minute need only high resolution encoder than may be needed belt reduction to the encoder shaft only, to get more pulses and not to whole motor shaft. Is this correct? Second, what is reasonable low feed with direct drive to motors that have 8192x4 puls per revolution? Third, how much those encoder, with 2 250 000 lines, may cost ? Thanks Aram
> [EMAIL PROTECTED] wrote: >> Hi >> I want to build system to tool grinder and that means that my system >> should behave stable on very low RPM. >> Minimum PRM 0.0001 per minute. I want to use direct drive with ball >> screw >> 5 rev per inch or 1 rev for 5 mm in case of metric system. >> My motors have 8192 pulse per .. it takes 4x8192 per revolution. It is >> AG >> industrial from servo dynamics. >> Any fundamentals ideas? >> Should I use higher resolution encoder? > If you really need .0001 Rev/Minute, that is 32768 counts * > .0001 = 3.3 encoder counts/MINUTE, or 18 seconds between each > encoder count. You can't get smooth motion like that. Of > course, .0001 RPM x 5 TPI on the screw is a movement rate of > .00002 IPM. Do you truly need it this slow? > > To get smooth motion, you really want an encoder count rate of > maybe 15 counts/second, or even better, 60. So, for 15 cts/sec > at .0001 RPM, you need 15 * 60 * 10000 = 9 000 000 counts/rev, > or 2 250 000 pulses/rev. This will be a pretty expensive > encoder. (Multiply by 4 for 60 counts/sec.) > > Jon > > ------------------------------------------------------------------------- > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Don't miss this year's exciting event. There's still time to save $100. > Use priority code J8TL2D2. > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
