> Jeffrey Pease wrote: >> I have no explanation for why this glitch is occurring in these spots, >> and no real idea how to fix it. Any ideas? >> >> My machine is using steppers and lead screws. Running EMC2 on Ubuntu >> 8.04.
Sebastian Kuzminsky wrote: ================================ > Which version of emc2? EMC2 2.2.8 > What hardware is driving your steppers? I'm using the EZ Driver Board from HobbyCNC.com. Perhaps more usefully, this board uses SLA7078MR stepper drivers, datasheet here -> http://www.datasheetarchive.com/pdf-datasheets/Datasheets-29/DSA-575103.pdf My board is configured for single stepping on all axes. > What config are you using? > What are your latency numbers like? 17901 ns latency, measured over almost an hour of messing around on the machine. I have both dirhold and dirstep for each motor set to 37901 based on the tuning info found in Chapter 28 of the Integrator manual. Hope that helps. Sorry, I know this is probably a tough issue to visualize as explained. Any suggestions would be appreciated. Thanks, Jeff > Hi EMC, > > I'm tuning my machine, and I am having some weird problems with the > EMC spiral example. This issue is entirely repeatable, and seems to > happen without fail regardless of any feed rate, acceleration or speed > settings that I have tried. > > What happens is on a particular place in every arc, the X and Y axis > both seem to stutter in the same way - pausing for a second before > continuing to finish the arc. This occurs in the area of the arc right > before each axis changes direction to start drawing the other half of > the arc - so the X axis stutters at 2:30, 3:30, 8:30, and the 9:30 > hour positions (the extreme left and right sides of each arc of the > spiral) and the Y axis stutters at 12:30, 5:30, 6:30 and 11:30 (the > extreme top and bottom of each arc). This strikes me as an unintuitive > spot for this stuttering to occur for each axis, since it seems like > the actual movement required at these points in each axis is > relatively small - once everything speeds up, it seems fine again. > > I have lubricated all the guide rods and lead screws (thinking it > might be some sort of binding issue), but that has not helped. > > The spiral appears to be perfectly smooth in these areas on the EMC > preview, so I don't believe it's a programming issue. > > I have no explanation for why this glitch is occurring in these spots, > and no real idea how to fix it. Any ideas? > > My machine is using steppers and lead screws. Running EMC2 on Ubuntu > 8.04. > > Thanks, > Jeff > > ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
