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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
