I'm using a DYN4 with the 1.8kw motor running in velocity mode to drive my spindle. I have it geared 1:1.8 giving me 5400 RPM at the spindle. I am controlling it via +-10v using a Mesa 7i83 connected to a 5i25. I added an index signal on the spindle and I am able to do rigid taping. If I was doing it again I would probably try a 1:2 ratio for 6K RPM at the spindle.
John
