So I just finished assembling my (very large, about 5 feet square) CNC. Everything functions very well (awesome design, I really love it), but I can get the CNC to produce smooth curves. I’ve been testing it out with a Sharpie instead of a router (since it’s just easier). I’ve been plotting a few simple SVG images and have noticed that when both the X and Y axes move at the same time, they don’t move smoothly. You can tell in the attached picture in the V that the lines filling it in aren’t exactly straight.
I’ve checked everything I can think of, but can’t figure out how to remedy the situation. I’ve tightened the timing belts and tightened the carriages. Both of these seemed to help, but I still can’t seem to eliminate the issue entirely. I’ve also watched the steppers on each side of each axis and they appear to be moving smoothly (there’s no visually obvious step that’s causing this). I’ll also note that the Sharpie is well secured and isn’t causing the ripples. The ripples seem to happen in the same place.
Does anyone have any ideas of what I can check or fix?