Here's some rapid speeds illustrated. This is a Sieg KX3 with Nema 34 566 oz on X and Y and 850 oz on Z: http://www.youtube.com/watch?v=-RaEThG0I0A&NR=1 http://www.youtube.com/watch?v=OjAS2t9fXxs&NR=1 That will sure gitter done! CR.