Is this machine a new machine? If it is a retrofit; What control did it have? Why did they replace the control? On May 6, 2013 3:01 PM, "Marius Liebenberg" <[email protected]> wrote:
> Peter, > I can surely try that although it might be very difficult due to the > high gearing. > My first reaction was that it was mechanical but then came the argument > of "only in one direction" and very predictable and repeatable. I am > waiting for my customer to make contact to arrange for me to go to the > machine and spend a day there to try and get to the bottom of this. I am > going to look very closely at the mechanics first. > > On 2013/05/06 05:14 PM, Peter C. Wallace wrote: > > On Mon, 6 May 2013, Marius Liebenberg wrote: > > > >> Date: Mon, 06 May 2013 07:14:34 +0200 > >> From: Marius Liebenberg <[email protected]> > >> Reply-To: "Enhanced Machine Controller (EMC)" > >> <[email protected]> > >> To: "Enhanced Machine Controller (EMC)" > >> <[email protected]> > >> Subject: Re: [Emc-users] Creep in X axis > >> > >> > >>> Are the drives AC servos so the encoder signals are in fact coming > >>> from the drives, not the encoder? > >>> > >> There is an encoder on the motor that is connected to the drive. The > >> feedback is then given by the drive. > >> > >>> If this is the case, is it possible tha the X axis drive is either > >>> faulty or improperly setup as regards encoder outputs? > >> I have swapped out the drive with one of the working axis. I also > >> swapped out the 7i33. There are two in the system and I swapped them > >> over. The error stayed with the x axis. > >> > >> > >>> > >>> Are you using differential signaling from the drive/encoder to the > >>> 7I33? > >> > >> Yes > >> > >>> > >>> If so, is the 7I33 setup for differential inputs > >>> > >> Yes > >> > >>> is the error affected by velocity? (same error if you move at 1/2 the > >>> speed?) that is, is it possible you are running into a count rate > >>> limitation somewhere? > >>> > >> There is a huge downward gearing on the x axis and we move very slowly > >> as the workpiece can be very heavy. It could be a problem that I will > >> have to check out. Why in one direction though? > >> > >> > >>> what is the encoder/drive simulated encoder resolution (counts per MM) > >>> and maximum X velocity? > >>> > >> I am guessing here a bit as I am nit close to the machine at this time. > >> The encoder scale is 3500 and max velocity is around 20000 mm/min > >> > > > > Hmm.. this is beginning to look more like a mechanical problem > > > > Can you mark the motor shaft and check the marks relative position to > > the motor case before and after a long move? > > > > > > > >> > >> -- > >> Regards / Groete > >> > >> Marius D. Liebenberg > >> MasterCut cc > >> Cel: +27 82 698 3251 > >> Tel: +27 12 743 6064 > >> Fax: +27 86 551 8029 > >> Skype: marius_d.liebenberg > >> Skype Me^(TM)! <skype:marius_d.liebenberg?call> > >> Get Skype <http://www.skype.com/go/download> and call me for free. > >> > >> > >> > >> > >> --- > >> avast! Antivirus: Outbound message clean. > >> Virus Database (VPS): 130505-1, 2013/05/05 > >> Tested on: 2013/05/06 07:14:36 AM > >> avast! - copyright (c) 1988-2013 AVAST Software. > >> http://www.avast.com > >> > >> > >> > ------------------------------------------------------------------------------ > >> > >> Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET > >> Get 100% visibility into your production application - at no cost. > >> Code-level diagnostics for performance bottlenecks with <2% overhead > >> Download for free and get started troubleshooting in minutes. > >> http://p.sf.net/sfu/appdyn_d2d_ap1 > >> _______________________________________________ > >> Emc-users mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > > > > Peter Wallace > > Mesa Electronics > > > > (\__/) > > (='.'=) This is Bunny. Copy and paste bunny into your > > (")_(") signature to help him gain world domination. > > > > > > > > -- > Regards / Groete > > Marius D. Liebenberg > MasterCut cc > Cel: +27 82 698 3251 > Tel: +27 12 743 6064 > Fax: +27 86 551 8029 > Skype: marius_d.liebenberg > Skype Me^(TM)! <skype:marius_d.liebenberg?call> > Get Skype <http://www.skype.com/go/download> and call me for free. > > > > > --- > avast! Antivirus: Outbound message clean. > Virus Database (VPS): 130506-0, 2013/05/06 > Tested on: 2013/05/06 09:57:16 PM > avast! - copyright (c) 1988-2013 AVAST Software. > http://www.avast.com > > > > ------------------------------------------------------------------------------ > Learn Graph Databases - Download FREE O'Reilly Book > "Graph Databases" is the definitive new guide to graph databases and > their applications. This 200-page book is written by three acclaimed > leaders in the field. The early access version is available now. > Download your free book today! http://p.sf.net/sfu/neotech_d2d_may > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. This 200-page book is written by three acclaimed leaders in the field. The early access version is available now. Download your free book today! http://p.sf.net/sfu/neotech_d2d_may _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
