Permissible Axial Load
Buckling Load on the Screw Shaft
With the Ball Screw, it is necessary to select a screw shaft so that it will not buckle when the maximum compressive load is applied in the axial direction.
Fig.12 shows the relationship between the screw shaft diameter and a buckling load.
If determining a buckling load by calculation, it can be obtained from the equation (5) below. Note that in this equation, a safety factor of 0.5 is multiplied to the result.
Permissible Tensile Compressive Load on the Screw Shaft
If an axial load is applied to the Ball Screw, it is necessary to take into account not only the buckling load but also the permissible tensile compressive load in relation to the yielding stress on the screw shaft.
The permissible tensile compressive load is obtained from the equation (6).
Point of Selection
- Conditions of the Ball Screw
- Conditions of the Ball Screw
- Estimating the shaft length
- Selecting lead･Selecting a shaft diameter
- Method for Mounting the Ball Screw Shaft
- Permissible Axial Load
- Permissible Rotational Speed
- Selecting a Nut
- Calculating the permissible axial load
- Studying the Service Life
- Studying the Rigidity
- Studying the Positioning Accuracy
- Studying the Rotational Torque
- Studying the Driving Motor
