Hi Brian, > As Dave noted, you are approaching the point on the spiral where the > movement on a given axis is at a minimum. With the full step and a > low > thread count, you might be encountering a detent on the motor perhaps?
Bingo, I think that nailed it. I was running 5 tpi lead screws at full step with 200 step/rev motors. I changed each of these to 1/4 step it it seems to run MUCH smoother on the spiral. It seems sort of obvious in hindsight, but it didn't occur to me that any loss of precision from running full step would actually make that perceptible of a difference in the stuff I do with my lowly hobbyist setup. I'm glad I picked the spiral as my test exercise as otherwise I might not have caught this and would have been pretty frustrated when making actual projects requiring any precision, I think. This is my first machine so I'm still getting a feel for the tradeoffs between low and high tpi leadscrews. I'm still running it through its paces, but so far it's a night and day difference. Thanks a lot! Jeff ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
