What are the minimum and maximum numbers of turns in a ball nut?
A. 1. A “turn” in a ball nut is equal to one circuit. That is one complete rotation around the ball screw. 2. The minimum number of turns for a bll nut is 1.5. One turn carries load balls with a .5 turn to allow for the recirculation of the ball bearings. 3. The maximum number of turns is 7.5. Beyond 7.5 turns additional turns carry too small a percentage of the load because of groove mismatch. This can lead to some balls carrying greater loads than others and premature failure.
