Hi Gene! How are you? Leonardo, If looking for a bunch of encoders, Peter may be able to build > a 7i90HD file to order. It has 72 i/o pins. So there's buckets of i/o. > With 4 encoders, I'm using 3 of them on the Sheldon, One for the > spindle, and two replace the cranks on the apron that allow me to drive > it by hand. The dis is the cost as it needs 3 7i44TA's to guard its > gpio pins from over 3.5 volts of logic. The config I'm using has 4 > encoders stock. It can be used with a parport breakout, or with a 3 wire > spi interface at quite blazing data speeds (42 megabaud writes, 25 > Megabaud reads) with an rpi4b clone doing the work.
Do you mean 7i42TA? that's probably another option. I only need to read frequency so I don't need quadrature or direction, so as Peter says I'll have more pins available. Hope you're doing great! El mié, 4 dic 2024 a las 11:34, gene heskett (<ghesk...@shentel.net>) escribió: > On 12/4/24 06:21, Leonardo Marsaglia wrote: > > Hi Andy, > > > > 7i89? > >> > >> Not as many encoders, because there are not as many pins... > > > Leonardo, If looking for a bunch of encoders, Peter may be able to build > a 7i90HD file to order. It has 72 i/o pins. So there's buckets of i/o. > With 4 encoders, I'm using 3 of them on the Sheldon, One for the > spindle, and two replace the cranks on the apron that allow me to drive > it by hand. The dis is the cost as it needs 3 7i44TA's to guard its > gpio pins from over 3.5 volts of logic. The config I'm using has 4 > encoders stock. It can be used with a parport breakout, or with a 3 wire > spi interface at quite blazing data speeds (42 megabaud writes, 25 > Megabaud reads) with an rpi4b clone doing the work. > > Had I built my 1940's Sheldon 11x54 first, I would never have used > anything else in my other 3 cnc'd machines. The other 3 were done first, > are run by big old Dells, with a 5i25 in the Dell and a 7i76D plus a > parport breakout, usually with the opto-isolators bypassed for speed. > That 5i25 encoder is watching a 1000 ppr encoder on the rear of the 1hp > motor on my GO704, rated for 1800 rpm but has not dropped a bit ever > once the opto's in the parport were bypassed. That 90 volt motor with my > 124 volt psu can do 21,000 rpms wide open. I'm amazed I haven't blown > the nylon gears in the heads gear-shift. I've been abusing it that way > since 2009. And still on the same factory brushes. I have i/o enough > left on that Sheldon build to run an Emco tool changer if I ever find > one I can afford. > > > Yeah, that seems like another option. > > > > El mar, 3 dic 2024 a las 22:52, andy pugh (<bodge...@gmail.com>) > escribió: > > > >> On Tue, 3 Dec 2024 at 15:32, Leonardo Marsaglia <ldmarsag...@gmail.com> > >> wrote: > >> > >>> The main concern to decide my configuration is: Is there a 7i53 like > >> board > >>> that uses the SERIAL I/O interface instead of the 50 pin connector? > >> > >> 7i89? > >> > >> Not as many encoders, because there are not as many pins...[...] > Cheers, Gene Heskett, CET. > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
