Hi John, Yes, I use step/dir for a harmonic drive AC Servo that as yet still has to be put into a casting and married to a face plate. For now it sits on the cart beside the mill and I can make the A axis turn. http://www.autoartisans.com/mill/HarmonicDrive/D8X_5784_Plastic_Mount.jpg I did try to get one of my DC Servos also working with a second STMBL. However I had trouble tuning it and the HP_UHU (105VDC power supply) has been more than adequate so for now I'm staying with that.
I used step/dir because initially my PC is dual boot and I wanted both MACH3 and LCNC to work. Along with also a BeagleBone with a cape for MachineKit so Parallel port and BoB were mandatory. That excludes any of the smart serial unless it terminated in a standard Parallel port configuration. John Dammeyer > -----Original Message----- > From: John Figie [mailto:zephyr9...@gmail.com] > Sent: September-13-21 3:39 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Suggestions for a retrofit. > > John, > > Thanks for the info so it looks like the Mesa Smart Serial interface can be > used with this drive. If I understand correctly the SSERIAL interface comes > from one of the mesa FPGA I/O cards and connects to the STMBL drive. (I > mean that is one way to interface to the STMBL drive). Otherwise a step and > direction or a quadrature input would be used with the STMBL drive. > > On Mon, Sep 13, 2021 at 3:53 PM John Dammeyer <jo...@autoartisans.com> > wrote: > > > John, > > The work has already been done with the STMBL project. The biggest issue > > with that one was the 3 phase motor driver was discontinued so that caused > > a bit of panic. But it's an open source project that can use step/dir or > > smart serial from the MESA boards. > > > > https://github.com/rene-dev/stmbl > > > > John Dammeyer > > > > > -----Original Message----- > > > From: John Figie [mailto:zephyr9...@gmail.com] > > > Sent: September-13-21 1:32 PM > > > To: Enhanced Machine Controller (EMC) > > > Subject: Re: [Emc-users] Suggestions for a retrofit. > > > > > > It's been a long time and I have not made much progress. Except now I am > > > retired from my job as an electrical engineer. In my job I developed > > > industrial PMAC servo drives for a leading industrial controls > > manufacturer > > > located in Milwaukee. So to solve my servo amplifier problem I have > > decided > > > to build my own and have already made significant progress. My homemade > > > drives will be able to run either DC brush motors or in the future AC > > > motors. I have a basic torque mode drive in the process of development > > but > > > I am thinking I would like the drive to be a velocity mode drive. > > > > > > My question now is how to interface to LinuxCNC? I really want to connect > > > all of my I/O using the mesa ethernet cards like the 7I80. From the 7I80 > > it > > > looks like there is a way to have SPI interfaces. It seems like the SPI > > > would be one way to make a simple digital interface to my drives. The > > 7I80 > > > would send velocity commands and velocity feedback to the drives. The > > > drives would return status and fault information back to LinuxCNC. > > > > > > Is it possible for me to use the SPI interfaces with LinuxCNC in the way > > I > > > have described? If so, how does one go about setting up the SPI > > interfaces > > > and defining what data is passed back and forth? I am hoping Andy Pugh, > > PCW > > > or someone that knows can comment. > > > > > > LinuxCNC <--Ethernet--> 7I80 -----<> I/O inputs and outputs > > > |-----<> SPI comms to > > > servo amps 7I46? > > > | ----< encoder inputs > > for > > > axis and MPGs > > > > > > LinuxCNC with position loop only should be able to run with a slower > > 1mSec > > > or maybe 500uSec thread and no other high speed thread would be needed. I > > > may however need to get the velocity feedback to my servo drive at a > > faster > > > rate for best/better performance. > > > > > > My reason for wanting Ethernet is I do not have to have my LinuxCNC PC on > > > or embedded in my machine, it can be several meters away mounted where it > > > won't be subject to heat and vibration. In addition with only one > > > interface, a PC upgrade or repair / swap is easy. > > > > > > > > > Regards, > > > > > > John Figie > > > > > > > > > On Sun, Nov 29, 2020 at 6:47 PM dave engvall <dengv...@charter.net> > > wrote: > > > > > > > > > > > > > > > On 11/27/20 10:52 AM, andy pugh wrote: > > > > > On Fri, 27 Nov 2020 at 18:45, John Figie <zephyr9...@gmail.com> > > wrote: > > > > > > > > > >> I think I am going to attempt to figure out what the parameters of > > my > > > > motor > > > > >> are and make a model to simulate my control loop. For hobby stuff I > > > > think > > > > >> LTspice may be good to model and simulate. > > > > > I am not sure what you hope to gain from a model. The data to > > populate > > > > > it would have to come from the actual machine, and at that point you > > > > > might as well just get on with it. > > > > > > > > > IIRC early versions of emc had motor parameters, etc tacked on the the > > > > end of the parameters for each axis. I don't know if any use was ever > > > > made of that. > > > > Maybe some of the early emc-ers with their memory still intact will > > > > remember as well as a model to insert the data into. > > > > Dave > > > > > > > > Just a comment: I've never had much success using torque mode: that > > > > doesn't mean I should not go back and revisit it. > > > > > > > > > > > > _______________________________________________ > > > > 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 > > > > > > > > _______________________________________________ > > 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 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
