Axial Rigidity Rax
Axial Rigidity
Approximate Values for Rigidity of Nuts and Spindle Rod Rigidity per m
Approximate values for rigidity of nuts and spindle rod rigidity per m
| Parameter | d0 [mm] | |||||||
|---|---|---|---|---|---|---|---|---|
| 25 | 32 | 40 | 50 | 63 | 80 | 100 | 125 | |
| Rnu* [kN/µm] | 0.5 | 0.7 | 1.0 | 1.5 | 2.1 | 2.5 | 2.8 | 3.1 |
| Rs [kN/µm] | 0.09 | 0.15 | 0.22 | 0.36 | 0.6 | 0.9 | 1.5 | 2.4 |
*) Values for preloaded double nut (P = 10 mm), see data sheets for other leads.
AM provides the ideal combination for you
- High axial rigidity
- Low no-load torque
Result: High efficiency and low operating temperature (see efficiency page chart)
Preload Fpr
Preload
Ball screws for high dynamic machine axes with changing load direction require nut preload Fpr. Especially during acceleration and braking, the balls must maintain contact with the thread profiles of the screw and nut. The preload value depends mainly on the acceleration and braking force Fai.
Standard Case
Preload Fpr approximately
Maximum Value
Can be increased up to
If required, we determine and adjust the optimal preload Fpr according to customer requirements for axial rigidity Rnu and no-load torque Tpr0.
Relationship between permissible acceleration and braking force Fai and preload Fpr