On Mon, 16 Jul 2012, Eric Keller wrote: > Date: Mon, 16 Jul 2012 15:57:56 -0400 > From: Eric Keller <eekel...@psu.edu> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: st...@pilotltd.net, > "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Spindle hooked to dc servo amp > > On Mon, Jul 16, 2012 at 3:43 PM, Steve Blackmore <st...@pilotltd.net> wrote: > >> >> Hi Jon - encoders here are only 90 and 120 ppr respectively as they are >> connected via parallel port as I had problems with higher value encoders >> being read reliably at anything more than a thousand revs or so. >> >> It almost seems that every time it gets an encoder pulse it gives the Z >> axis a kick. The faster you go the less noticeable it is, but at slow >> speeds it's poor and sounds like what Gene described. >> >> Steve Blackmore >> -- >> > It's likely that the resolution in combination with whatever jitter you may > have in reading the parport is your problem. I know I'm ignoring a long > thread of emails, but with the right kind of filter, you might be able to > get rid of it. I'm thinking that taking the motor drive command into > account (if possible) in the filter it might overcome Jon's objection to > the delay caused by the filtering. > Eric > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users >
Actually it seems that people that have trouble with encoder comp velocity jitter may have the encoder connected incorrectly in the HAL file and thus do not get the improved, timestamped encoder edge velocity estimate. Getting a velocity spike every encoder count is a givaway Peter Wallace Mesa Electronics ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
