Long story short decided to do a complete rebuild of my old K40 into a custom machine. (Laser tube and PSU about the only things that came over)
Total the new frame is 1000mm x 500mm. I’m using a single NEMA17 dual shaft motor for the Y and a single NEMA17 single shaft for the X, using GT2 belts lopped and connected to their respective carriage.
I have noticed that even at slow speeds I get a wobble in my lines at the start of a cut or direction change, and a slight misalignment when the cut ends. I did some test burns at 5, 20, and 40mm/s and they all show this wobble and misalignment. I think it’s in different spots of each test shape due to the order the burns were made; but at 5mm/s I would not think speed had a big influence.
Could the GT2 belt be acting like a big spring, especially on the X axis since the loop is nearly 2meters long as it’s a loop. I can’t think of alternative movement options that would not add a ton of weight to the moving carriage and thus intera.
I am using linear rails to guide the movement but of course they are mounted using 3D printed parts so their rigidity could be better.
Photos on my test burns attached.