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 the ball screw spline is applied the load exceeding the allowable value, it is necessary to replace the ball screw spline unit.
The allowable loads differ depending on distance where the load is applied to. For calculating the allowable load, see the calculation formula below.

Symbol	Description
a	End of the spline nut

Example:

If 110 N (11.2kgf) load is applied at 400 mm from the end of the spline nut

Allowable bending moment

M=80,000 N·mm

Moment

M=F·L＝100·400＝44,000 N·mm