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
