Thanks guys, by resolution you mean what measurement divisions "on the dial" so to speak?
Well because of the purpose i don't think measurement is critical, i'm building a recording lathe (that records are made on). The cutter carriage has fixed start and end points for the cutting range other than that the actual measurement i don't think is critical. So the answer is i don't know!! But the feed rate must be down to about 2mm/min. Are there methods for working out what i need?
I posted a pic of a commercial recording lathe in another post here:http://www.mycncuk.com/forums/showth...siastic-Newbie