Ball Screw Support: Top 4 Methods Unveiled | MachineMFG

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Ball Screw Support: Top 4 Methods Unveiled

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Fixed at One End, Free at the Other

Fixed at One End, Free at the Other

Features:

  • This setup is simple in structure but has low axial stiffness and critical speed, resulting in poor screw stability. It is primarily used for short strokes and vertical transmission.
  • One end is fitted with an angular contact ball bearing assembly, while the other end is free.

Fixed at One End, Supported at the Other

Fixed at One End, Supported at the Other
  • The most typical and commonly used installation method for ball screw mechanisms, suitable for medium speed applications where both stiffness and precision are relatively high.
  • The support end has slightly less rigidity.
  • One end is equipped with an angular contact ball bearing assembly, and the other end with a deep groove ball bearing.

Supported at Both Ends

Supported at Both Ends
  • Suitable for general applications where medium speed, stiffness, and precision are not highly demanded. This configuration is simple in structure, has low bearing stiffness, and poor force-bearing capacity, thus it’s less commonly applied.
  • Both ends are fitted with deep groove ball bearings.

Fixed at Both Ends

Fixed at Both Ends
  • Capable of bearing higher axial loads, the screw’s axial stiffness is approximately four times higher than the configuration where one end is fixed and the other supported. This setup is suitable for high-speed rotation, high precision, and longer screw lengths. However, it has drawbacks, such as a complex structure and sensitivity to thermal deformation of the screw due to axial demands.
  • Used in machines requiring high rigidity.
  • The most significant feature of this support method: the ball screw is pre-stretched to compensate for thermal deformation caused by frictional heat during high-speed rotation.
  • Both ends are equipped with angular contact ball bearing assemblies (DT-DB configured in pairs for installation).

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