Life design of ball screw

(1)Ball Screw life

Even if the ball screw is used in the correct condition,

it will become unusable after a certain period of time.

The life of the ball screw is the time from deterioration to unusable, 

which is generally divided into the fatigue life 

when peeling occurs and the life of accuracy degradation caused by wear, etc.

(2)Basic static load rating Coa

The so-called basic static load rating refers to the amount of permanent deformation

between the contact part of the ball groove in the screw shaft 

and the nut that is subjected to the maximum stress and the steel ball.

It is called the axial load when it reaches 0.01% of the diameter of the steel ball.

(3)Basic dynamic load rating Ca

The so-called dynamic rated load means that a batch of the same

ball screw rotates 10° times under the same conditions,

and 90% of the ball screws will not peel due to rolling fatigue.

At this time, the axial load borne is the dynamic rated load. (Ca).