Method for Mounting the Ball Screw Shaft
Fig.8 to Fig.11 show the representative mounting methods for the screw shaft.
The permissible axial load and the permissible rotational speed vary with mounting methods for the screw shaft. Therefore, it is necessary to select an appropriate mounting method according to the conditions.
Determining the Permissible Axial Load (Buckling Load on the Screw Shaft)
● For Fixed-Fixed Confi guration (see F ig. 10, Fig. 11)
Permissible Axial Load Calculate the buckling load for A and B (the distances between mounting surfaces) using formula 5, and use the smaller value as the screw shaft buckling load.
● For Fixed-Free, Fixed-Supported Confi guration (see F ig. 8, Fig. 9)
Permissible Axial Load Use B in formula 5 to calculate the screw shaft buckling load.
Determining the Permissible Screw Shaft Rotational Speed (Critical Speed of the Screw Shaft)
Permissible Rotational Speed Calculate the critical speed for A and B (the distances between mounting surfaces) using formula 7, and use the smaller value as the screw shaft critical speed.
Selection Criteria
- 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
