The torque that the guide rail can withstand is divided into dynamic allowable torque and static allowable torque.
The dynamic allowable torque is calculated based on the operating life (occurrence of fatigue spalling) when operating under the applied load torque.
On the other hand, the static allowable torque is calculated based on the load that causes permanent deformation of the steel ball and its rotating surface when a load torque is applied to the guide rail in a static state (static rated torque), taking into account both the rigidity and deformation of the base.

Dynamic allowable torque

The product catalog of our company indicates the dynamic allowable torque when operating at 10000km or 5000km with a load factor fw=1.2.
This value is different from the basic dynamic rated torque that is commonly referred to as an operating life of 50km.
When calculating the basic dynamic rated torque with an operating life of 50km, it can be calculated using the following formula.

In addition, the dynamic allowable torque (10000km or 5000km lifespan) listed in the product catalog is the value when the load factor fw is 1.2. If other load factors are chosen,
Please calculate the lifespan of the guide rail based on the required operating and installation conditions, taking into account the load factors shown in Table 1.

Static allowable torque

The limit torque value that a stationary slider can withstand.
These values are calculated by multiplying the basic static rated torque of the slider by the safety rate (taking into account the effects of stiffness or deformation of the base).
Therefore, in the static state of the slider, when the torque load increases, it must be controlled within the allowable static torque range. However, due to the inertia of the applied load, impact loads may sometimes occur, and the generation of impact loads should be avoided.

Basic static rated torque

The basic static rated torque refers to the torque value when the sum of the permanent deformations at the center of contact between the rotating body (steel ball) and the rotating surface (track) reaches 0.0001 times the diameter of the rotating body. This value is calculated solely based on the permanent deformation of the steel ball and its rotating surface as the limiting condition. In practical situations, factors such as the rigidity or deformation of the installation base can also limit the torque value. Therefore, considering such factors, the actual static allowable torque marked is actually the static allowable torque.