Ball Return Systems
The bearing balls travel inside the screw and nut thread. If the ball nut did not have a return mechanism the balls would fall out of the end of the ball nut when they reached the end of the nut. For this reason several different recirculation methods have been developed.
An external ballnut employs a stamped tube which picks up balls from raceway with use of small pick up finger. Balls travel inside of tube and are then replaced back in thread raceway.
An internal button ballnut employs a machined or cast button style return which allows balls to exit raceway track and move one thread and reenter raceway.
An endcap return ballnut employs a cap on the end of ball nut. The cap is machined to pick up balls out of the end of nut and direct them down holes which are bored transversely down the ballnut. The compliment cap on the other side of nut directs balls back into raceway.
Read more about this topic: Ball Screw
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