Well, apparently the problem didn't get resolved with the jog velocity vs axis velocity thing….
Begin forwarded message: > From: Peter Jensen <jensen_rem...@yahoo.com> > Subject: Screenshots > Date: October 16, 2011 2:19:43 AM EDT > To: Tom Easterday <tom-...@bgp.nu> > Reply-To: Peter Jensen <jensen_rem...@yahoo.com> > > > Ok, you know how I said I fixed the problem? Well, apparently not. It's > doing it again. > > One important thing to pay attention to is that the error is that the > reported "actual" position is getting AHEAD of the commanded position, and > then at the end of the move jumping BACK. All the moves in the images below > are from jogging in the positive direction on Axis 1. There are 4 images, > taken with progressively faster jog speeds (you can see the jog speed in the > jog slider on the left hand window). > > I am simply holding down the jog-positive key for a second or two, then > letting go. When I took these screen grabs, the motor power is off, nothing > is actually moving, and no encoder is actually connected to EMC. If I turn > on the motor power, the motors do move and can be seen to come to the end of > the jog and then move quickly back a fraction of an inch, just as these > following errors would indicate (and the hal-scope graphs are the same - the > motors being on or off has nothing to do with this, as there is no encoder > feedback connected to EMC or the mesa card). > > Note that the Y axis scale of the following error is different in each > image. As the speed increases, the "following error" increases. > > The scaling factor is 25464.79089470325 steps per inch, and the step length > and step space parameters are both set at 300 nano-seconds each (for a total > of 600 nano-seconds per step). At 3600ipm there would be 654 nano-seconds > between steps, and this test topped out at only 3180ipm, so we should not be > running out of time. > > So, there it is. Go figure. :) > > -- > Peter J. Jensen > http://bgp.nu/~tom/pub/Screenshot1.png http://bgp.nu/~tom/pub/Screenshot2.png http://bgp.nu/~tom/pub/Screenshot3.png http://bgp.nu/~tom/pub/Screenshot4.png ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2d-oct _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
