Hi Mark

Thanks for the info, i understand what a servo is would just like to know what others are actual using for control of their servo. I do have a plain bearing spindle i built running with an er16 chuck, geared 2:1 to a dc motor as well. This is not a great performer and could do with a bigger motor. The trouble is then it all becomes very large and cumbersome For my intension i will be running at about 6-7k RPM on my 1 X 1.5 machine so a large servo should fit the bill. If i choose right then i should be able to push the shaft out, machine the end to fit a colet nut.