On Friday 14 December 2012 23:50:04 Peter C. Wallace did opine: > On Fri, 14 Dec 2012, Kent A. Reed wrote: > > Date: Fri, 14 Dec 2012 22:41:54 -0500 > > From: Kent A. Reed <kentallanr...@gmail.com> > > Reply-To: "Enhanced Machine Controller (EMC)" > > > > <emc-users@lists.sourceforge.net> > > > > To: "Enhanced Machine Controller (EMC)" > > <emc-users@lists.sourceforge.net> Subject: Re: [Emc-users] Question > > on the loadable module ddt > > > > On 12/14/2012 9:57 PM, Gene Heskett wrote: > >> Greetings; > >> > >> I never got far enough in math to know what a 'derivative' is. Does > >> anyone have a URL where I could learn a bit about this function? > >> > >> Thanks. > >> > >> Cheers, Gene > > > > Actually, the wikipedia article isn't bad: > > http://en.wikipedia.org/wiki/Derivative > > > > If it gets too mathematical too quickly, just remember the geometric > > interpretation: for a smooth continuous curve represented by a > > function f(x), the slope of the curve at a point x=p is the > > derivative of the function df/dx evaluated at x=p (ignoring all the > > messy bits that require the mathematics to explain). > > > > Regards, > > Kent > > And d/dt specifically: > > http://en.wikipedia.org/wiki/Time_derivative Is this not essentially the same as turning up the Dgain in the pid box then? Thats a full stop lost cause, with anything over about .001 making it audibly hunt worse, at loosely 2-3 hertz. > Peter Wallace > > > ------------------------------------------------------------------------ > ------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free > Trial Remotely access PCs and mobile devices and provide instant > support Improve your efficiency, and focus on delivering more value-add > services Discover what IT Professionals Know. Rescue delivers > http://p.sf.net/sfu/logmein_12329d2d > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > 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) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! Windows 98: New look, same multicrashing. I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
