I disagree a little. I think the problem is only money, not technical. Yes it seems to be well past the technical ability of most of the DIY community.
If you can stand $2,000 or more per axis Bosh (intraDrive) will sell you a really nice system and they can support it. They are driven by can bus or Ethercat. If you have a $200,000 robot spot welding machine that builds automotive car bodies, what is a new grand per axis? The cheapest system I could find is by Leadshine in China and the smallest size controller is $350 per axis but they are unable to support you if you are in North America buying low retail quantities. I looked into what it would take to build a DIY Ethercat based client controller. The minimum buy-in to get started with DIY Ethercat slaves requires assess to Beckhoff ASIC chips, the ability make your own 4 sided PCBs and re-flow soldering ovens. Basically professional level electrical engineering skills and equipment I looked into using FPGA solutions and found the low-end FPGA development boards are not nearly fastest enough. On Sat, Oct 28, 2017 at 2:13 AM, theman whosoldtheworld <bleachk...@gmail.com> wrote: > Ok. Just fun I would say it's a good thing. I also tried the Estun. I would > say great product for the price paid. If you have to do a 3D printer that > works for 48 hours, or an electrorube device, I recommend you continue to > use mesa cards.Personally, I did not have problems on the drive side, but I > had problems deleting the digital outputs of an I / O slave ... Delays in > the order of 50ms and I only noticed after 4 hours of work. As I saw this I > stopped the tests and found out that the problem came from the bus > (although I do not know how) .... using the outputs on board a 7i66 > everything work fine. > > in any case my warning to avoid for now using realtime ethernet buses is in > the fact that the producers are selling too little performance software > compared to the ardware on board. So they want to do too many things .... > but in some time I guess the right hardware will become economical enough > because it can be mounted on the devices. > > That said this next month I will start a new test with a different product > .... and I hope in January to be able to put on board a commercial plc > rt-ethernet open source. > > bkt > > > 2017-10-27 12:40 GMT+02:00 Nicklas Karlsson <nicklas.karlsso...@gmail.com>: > >> I make my own hardware, it's only for fun and I do not intend to earn money >> on it. It's however useful to know how it works during normal working >> hours. >> >> 2017-10-27 11:07 GMT+02:00 theman whosoldtheworld <bleachk...@gmail.com>: >> >> > I use the suggestion and indication from linuxcnc forum: >> > >> > https://forum.linuxcnc.org/24-hal-components/22346-ethercat-hal-driver >> > >> > about SOEM, The basic implement is not realtime .... so is ok for user >> > command, not so for drive command. Any how my decision is not utilize >> > ethernet bus for drive position/velocity/torque command. Mesa analogue >> > signal and feedback encoder on mesa card are too easy and precise signals >> > to use to go for alternative methods that usually do not give such good >> > performances. Keep in mind that realtime on ethercat is not a universal >> > value ... commercially there are devices that go under 1 ms but others >> that >> > arrive up to 10-20ms .... for example kunbus has made devices on pi3 with >> > ethercat and more, but with a realtime of 5ms. >> > >> > I have made the opinion that bus-rt on ethernet are very nice, but they >> > will really be useful only in some have. in the meantime it is best to >> play >> > on to be ready and wait. If you would use it for data comm between some >> > device or for connect some device without problem of 5-10ms response time >> > all work fine. I could not recommend any ethercat for professional use >> as a >> > result of my experiences. But I'm sure many others have taken advantage >> of >> > it. >> > >> > Last but no least, there is also the security issue. Here in Europe >> > ethernet-ip and secure signals do not agree much for example. In >> addition, >> > many drive manufacturers do not have safety over ethercat even if they >> have >> > the bus. >> > >> > >> > regards >> > bkt >> > >> > 2017-10-26 18:19 GMT+02:00 Nicklas Karlsson < >> nicklas.karlsso...@gmail.com> >> > : >> > >> > > On Thu, 26 Oct 2017 13:36:26 +0200 >> > > theman whosoldtheworld <bleachk...@gmail.com> wrote: >> > > >> > > > I'm working with it now using linuxcnc implementation ... and in past >> > > with >> > > > backoff device. ... >> > > >> > > I just started to look a day or two ago, which Ethercat implementation? >> > > >> > > ------------------------------------------------------------ >> > > ------------------ >> > > 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 >> > >> ------------------------------------------------------------ >> ------------------ >> 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 -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ 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
