Originally Posted by
gardengirl1331
My work surface is my dinning room table, it is stable when going slow, and moves a bit when I hit one speed, but when I go a tiny tiny bit faster it stops the movement, it's weird, it's only one speed it does this with!
Not weird at all. At that one speed, the frequency of the machine stitching is matching a harmonic frequency of the table and it's basically a motion that's being amplified by the table top. It's physics.