Strength of the Ball Screw Spline

If a load exceeding the allowable value is applied to the ball screw spline, it may not work properly due to deformation or breakage of the shaft.

If a load exceeding the allowable value is applied to the ball screw spline, the ball screw spline unit must be replaced.

The allowable load varies depending on the distance over which the load is applied. For calculating the allowable load, see the calculation formula below.

Symbol	Description
a	End of the spline nut

Allowable bending moment

• LA3-A: M=13,000 N∙mm

• LA6-A: M=27,000 N∙mm

Moment

M=F·L＝100·100＝10,000 N·mm

Example:

If 100 N (10.2kgf) load is applied at 100 mm from the end of the spline nut