That is true, Mesa's 7i85S is made just for this purpose. I have one running a machine now, very very nice compared to software stepping. The addition of the encoder feed back made tuning the servo drives much simpler. I don't know if the final result is any better than ordinary open loop hardware stepping, but on this machine I have had difficulty getting a good tune on the drives, using just a scope and the drives tuning software.
----- Original Message ----- From: "andy pugh" <bodge...@gmail.com> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: Tuesday, June 10, 2014 9:07:49 PM Subject: Re: [Emc-users] New toy (4'X8' Router) for conversion On 11 June 2014 01:54, Chris Kelley <tensait...@gmail.com> wrote: > The > servo drives still only take step and direction signals so while we can't > close the loop back to LCNC That's not necessarily true. You can see step-dir as just another velocity command method, like analogue voltage or PWM. If you use velocity-mode stepgens instead of pwms then the LinuxCNC part would look very much the same. This does assume you can get the encoder signals back to LinuxCNC from the drives, though. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing & Easy Data Exploration http://p.sf.net/sfu/hpccsystems _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing & Easy Data Exploration http://p.sf.net/sfu/hpccsystems _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
