So I am understanding you to say that if I get say the 2500 count/rev encoders and, say a 1.6 gig processor that your system would not have a problem with it?
How hard will this be to tune? If later on I wanted to sync the spindle, would it do it? Andy Jon Elson wrote: >Andy Holcomb wrote: > > >>What resolution of encoders have should I use, my first thought is as >>high as possible, is my logic wrong? >> >> >If you are going to use Gecko 320's and software step >generation, then your logic is indeed wrong. Depending on your >software and CPU choice, software step generation maxes out at >40 - 50 thousand steps/second. Assuming a 5 TPI leadscrew with >the encoder directly driven from it, and 100 IPM rapid feeds, >then you have 500 RPM on the screw. If the encoder has, say, >1000 cycles/rev, that gives 4000 counts in quadrature, so you >have 500 * 4000 = 2,000,000 counts/minute, or 33,333 >counts/second. That is nearing the limit of software. If you >wanted higher encoder resolution or higher rapid feed rates, you >would be out of luck. > >If you are using hardware step generation, or get rid of the >steps entirely, like with my PPMC or universal PWM controller >system, then it is not a concern. > >Higher encoder resolution leads to a stiffer and smoother servo >response, in general. > >Jon > >------------------------------------------------------------------------- >This SF.net email is sponsored by DB2 Express >Download DB2 Express C - the FREE version of DB2 express and take >control of your XML. No limits. Just data. Click to get it now. >http://sourceforge.net/powerbar/db2/ >_______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
