Thanks, got it.. Roland
On 1 March 2017 at 17:11, Kurt Jacobson <kurtjacob...@bellsouth.net> wrote: > There is no "divide by 4", the machine just moves in increments that are > one fourth the jog increment. For example if you have the increment set to > .001 the machine will move .00025 four times per detent, which does result > in 4 times smother moment. > > Kurt > > On Wed, Mar 1, 2017 at 10:01 AM, Roland Jollivet < > roland.jolli...@gmail.com> > wrote: > > > On 1 March 2017 at 16:02, John Kasunich <jmkasun...@fastmail.fm> wrote: > > > > > > > > > > > On Wed, Mar 1, 2017, at 07:42 AM, Roland Jollivet wrote: > > > > I had always assumed that machine MPG's generated one state change > per > > > > click, but following Gene's discussion, I pulled out my 1988 Fanuc > MPG, > > > and > > > > saw that it was also 4-states per click. Obviously, one > 'pulse'/detent > > > > > > > > Does anyone know the rationale behind this? > > > > I assumed one always wants one step per click, so why not use a 25ppr > > > > encoder and use every change? > > > > Used as currently is, it would have to be a software /4 to be useful. > > You > > > > could also do a /2 or /1, but no-one ever wants a x2 or x4 on their > MPG > > > > It's always x10, x100 or whatever, so the count/detent would always > > have > > > to > > > > be n/4 x 1 .. or.. n/4 x10 in software. > > > > > > > > Alternatively, if I was going to make my own MPG, surely I would just > > > make > > > > a 25ppr encoder and make it 1 detent/change? > > > > It's far easier for me to make, so surely it would have been for > Fanuc > > > too? > > > > > > > > What am I missing? > > > > > > > > > > Smoothness of movement is 4x better with the finer resolution. > > > > > > -- > > > > > > > Ok, but I would think; > > Surely the result is the same if you're doing an immediate /4? > > > > Then if you're cranking the wheel with the handle, won't software > calculate > > average speed and advance evenly until you stop? > > > > And if you hold the wheel with a few fingers approaching final point and > do > > a slow click-click, then isn't the x4 advantage irrelevant? > > ------------------------------------------------------------ > > ------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
