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
