Dave you are correct, That was what I said. In one email I kicked around the idea of removing the encoders from the motors and installing OEM tachs and the installing scales or separate encoders on the machine mechanics to track position. The US digital box seems like the way to go but I am still taking input from all of you. You all have been a big help.
Dave ----- Original Message ----- From: "Dave" <[email protected]> To: "Enhanced Machine Controller (EMC)" <[email protected]> Sent: Saturday, March 20, 2010 4:17 PM Subject: Re: [Emc-users] G52 and Fanuc conversion to EMC > Perhaps I didn't understand. > > I thought you mentioned that you already have encoders on the motors and > that the existing GE controls derrived a velocity signal from that board > and fed that back to the existing servo amps? > > If that is the case, you really only need one encoder to track the > motors and you already have that. > > It sounds like with the addition of the US Digital boxes and your > existing motor mounted encoders you are all set. > > Yep, I think I would try and reuse those drives and motors. It would be > far cheaper to have them rebuilt than replace them. > > Dave > > 3/20/2010 1:55 PM, Paul Keeton wrote: >> Thanks for the reply Ray. This is a very large machine with very large >> drives and motors. The travel limits are 120" in X, 58" in Y and 24 in Z. >> It >> has (3) 20 HP spindles on 24 inch centers. High quality servo >> replacements >> for this machine are quite expensive due to the torque requirements. >> Around >> 12 to 15k per axis is about the norm I have been finding. Reusing these >> drives and motors would save a big chunk of green if I can get it to >> work. >> Do you see a problem with separate encoders with emc? I am not holding >> anyone accountable, just looking for opinions! The link I gave earlier >> from >> US Digital was only $195.00. I would have to buy 3 of them but that is >> still >> a far cry from the cost of new servos. >> >> Dave >> ----- Original Message ----- >> From: "Ray Henry"<[email protected]> >> To: "Enhanced Machine Controller (EMC)"<[email protected]> >> Sent: Saturday, March 20, 2010 2:36 PM >> Subject: Re: [Emc-users] G52 and Fanuc conversion to EMC >> >> >> >>> Yes and there are others that build similar devices. There are some >>> limitations to the quality of the dc signal that depends upon the >>> quality of the converter and the way that it handles both rapid and very >>> slow motions. >>> >>> We had this issue with the Mazak we converted as a group during >>> CNC-Workshops. The Fanuc 6M control synthesized a tach signal for the >>> drives from motor encoders. There was no tach generators on the motors. >>> >>> Rather than trying to create such a signal from EMC2 we swapped out the >>> old Fanuc drives with new drives and ran these current mode. JohnK >>> worked on tuning for a couple days and axis motion was as smooth as any >>> I've worked with. I don't think the drives cost all that much more than >>> a quality converter >>> >>> HTH >>> >>> Rayh >>> >>> >>> On Sat, 2010-03-20 at 14:08 -0400, Paul Keeton wrote: >>> >>>> Luckily its not my money! Do you think that would work? >>>> >>>> Dave >>>> >>>> ----- Original Message ----- >>>> From: "Gene Heskett"<[email protected]> >>>> To: "Enhanced Machine Controller >>>> (EMC)"<[email protected]> >>>> Sent: Saturday, March 20, 2010 1:53 PM >>>> Subject: Re: [Emc-users] G52 and Fanuc conversion to EMC >>>> >>>> >>>> >>>>> On Saturday 20 March 2010, Paul Keeton wrote: >>>>> >>>>>> Stephen, >>>>>> >>>>>> I think I have located the answer for keeping the >>>>>> encoders >>>>>> on >>>>>> the motors. Follow this link: >>>>>> >>>>>> http://www.usdigital.com/products/etach2/ >>>>>> >>>>>> Please tell me what you think. >>>>>> >>>>>> Dave >>>>>> >>>>>> >>>>> Waaaayy out of my price range at $195/channel. >>>>> >>>>> -- >>>>> Cheers, Gene >>>>> "There are four boxes to be used in defense of liberty: >>>>> soap, ballot, jury, and ammo. Please use in that order." >>>>> -Ed Howdershelt (Author) >>>>> >>>>> The only cultural advantage LA has over NY is that you can make a >>>>> right >>>>> turn on a red light. >>>>> -- Woody Allen >>>>> >>>>> ------------------------------------------------------------------------------ >>>>> Download Intel® Parallel Studio Eval >>>>> Try the new software tools for yourself. Speed compiling, find bugs >>>>> proactively, and fine-tune applications for parallel performance. >>>>> See why Intel Parallel Studio got high marks during beta. >>>>> http://p.sf.net/sfu/intel-sw-dev >>>>> _______________________________________________ >>>>> Emc-users mailing list >>>>> [email protected] >>>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>>> >>>>> >>>> >>>> >>>> ------------------------------------------------------------------------------ >>>> Download Intel® Parallel Studio Eval >>>> Try the new software tools for yourself. Speed compiling, find bugs >>>> proactively, and fine-tune applications for parallel performance. >>>> See why Intel Parallel Studio got high marks during beta. >>>> http://p.sf.net/sfu/intel-sw-dev >>>> _______________________________________________ >>>> Emc-users mailing list >>>> [email protected] >>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>> >>> >>> ------------------------------------------------------------------------------ >>> Download Intel® Parallel Studio Eval >>> Try the new software tools for yourself. Speed compiling, find bugs >>> proactively, and fine-tune applications for parallel performance. >>> See why Intel Parallel Studio got high marks during beta. >>> http://p.sf.net/sfu/intel-sw-dev >>> _______________________________________________ >>> Emc-users mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >>> >> >> >> ------------------------------------------------------------------------------ >> Download Intel® Parallel Studio Eval >> Try the new software tools for yourself. Speed compiling, find bugs >> proactively, and fine-tune applications for parallel performance. >> See why Intel Parallel Studio got high marks during beta. >> http://p.sf.net/sfu/intel-sw-dev >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> > > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
