High-efficiency ballscrews are ideal for precise, high-speed linear positioning. However, back-driving can be an issue, especially if the ballscrew is in a vertical position. If the ballscrew is not held properly, the load could drop quickly and cause damage to the payload, machine and workers.

To prevent that from happening, engineers have several options. One way is to use counterweights placed over cable pulleys to offset the weight of the load carried on the ballscrew. This design is not ideal. It takes up space, has a lot of components, and does not apply a holding force directly on the ballscrew.