JAZZ, Not quite that fast but have gotten it up to 12.5m/min rapids with an acceleration of 1.5m/sec^2. These days I am running it most the time at rapids of 7m/min on the x and y axis and 5.2m/min on the z axis with a acceleration of 1m/sec^2. Which with the mentioned motors and drivers and a well set up CV mode gives me cutting speeds possible of 4.8m/min with a 4mm Single Flute Lapped end mill with a 6mm shank. As JAZZ asked what voltage are you running at. I could run in crazy land IF I moved acceleration down to about 500mm/sec^2 but let me tell you 12.5m/min gets scary on my machine. -Michael