> > > > The splitting would not work for the servos that have the driver > > > > integrated though. > > > > > > Why not? > > > > There are no pins to connect to :) > > That I should point out, is generally NOT a problem for a CET. >
LOL ... I agree. > At least not until one would "fix" that inside the driver itself. And I > > am not so eager to do that. > > It might be difficult mechanically, but the points to grab ARE in the > circuit. Generally useing a scope probe to help in identify them. I am pretty sure I *could* do it - but I am pretty sure I don't want to make things more complicated than they already are :) And you are right. There isn't much space mechanically. > > So that would NOT be a recommended setup? > > I think it would be good, given that todays hardware is considerably > faster, Nyquist (time delay phase shifts) caused instability stuff s/b > much less of a problem and I expect it would be quite easy to do today. > Except for the problems you are mentioning it would kind of make sense - to me at least. At least for steppers. (Not sure this would work for servos. I guess they usually always come with their own PID loop?) Particularly if you pay attention to the addf order in the hal file. > /me doesn't understand that yet, but makes a note for later :) > I am slowly running out of ideas what is :) > > Tell us what you want to do? Probably not me, but there are folks here > with far more knowledge than I've experience with, that can give you an > idea how to do it. > Well, this is the dev list - so I rather wanted to focus on the protocols and how things are supposed to work conceptually to understand my options. But since you are asking that directly I am happy to share... I've built a smallish CNC (1000x700mm) and I still have some JMC 180W Servos (V5) that I wanted to use on the machine. Now I am looking at my options for driving them. The options for the controller: - old GRBL board (nah) - RPi3 with a Protoneer GRBL hat (maybe until I find something better) - Esp32 GRBL (didn't find good boards, price difference to a Mesa is getting smaller) - Teensy GRBL (sounds pretty good for a GRBL, maybe, price difference to a Mesa is getting smaller) - Some old PC with a Parallel Port (but it seems hard find and I am not such a fan of the idea, I rather have the stepgen on a board) - Some old PC with a Mesa 7i96e (would probably have been my choice but not going to happen due to availability, at least in the EU) - Some old PC with a Nvem and Remora (not so super eager as Remora seems still to be a one man project and still quite beta) ...and I think I really want to go with LinuxCNC :) As for the motors. People are bitching how hard it is to parameterize those servos. I am told the two motors on the Y axis can become a real problem. But I am still tempted to at least give that a try. It would be nice if I could write some LinuxCNC integration that talks via modbus to help with the configuration. That will also need 4 UARTS/RS232 on the PC though. Icing on the cake would be if the LinuxCNC could monitor the modbus and slow down the motion if the following error becomes too big. That said In retrospect I am also not such a fan of the integrated servo drivers anymore - and with all the things still in limbo... ...it also crossed my mind to just get some closed loop steppers and probably be done with it. BUT my ballscrews are 05mm and planned for servo speeds. I don't really want to go from the idea of the dynamic servo driven machine to the stepper turtle :) Bottom line: If the Mesa wasn't out of stock for the unforeseen future I would have probably just gotten one and tried. Now I have to come up with a plan B and was wondering about the alternatives. So I find myself looking through mach3 boards and wondering about the reasons they cannot be used with LinuxCNC. Which made me curious and I started digging - down the rabbit hole ;) Hope that explains the status quo. cheers, Torsten _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
