A.

1. single nut preloading: (including oversized steel ball preloading mode and lead offset preloading mode)

2. double nut preloading: (including: Tension preloading and compression preloading)

B.

1. preloading method of oversized steel balls: (adjust the preloading according to the size of steel balls)

Features: four point contact between steel ball and ball groove, suitable for light preloading

2. lead offset preloading method: (increase pitch or reduce pitch)

Features: made on the nut pitch δ Value to replace the traditional double nut preloading method. This method is more suitable for medium and light preloading. It is better to design the preload below 5% dynamic load.

3. tension preloading method

Features: two nuts are externally tensioned with an over thick pre pressing plate to achieve the pre pressing effect, which is the most commonly used method of HIWIN precision ball screw.

4. compression preloading

Features: the two nuts are locked together by a thin pre pressing plate and bolts to achieve the pre pressing effect.