Within linear guideways, the block can be preloaded to increase stiffness and the internal preload must be considered in the life calculation. Preload is classified by three classes: Z0, ZA,ZB, Each preload level has a different deformation of the block, higher stiffness presents lower deformation. Stifness in three axis are used by most applications.
A preload can be applied to each guideway. Oversizedballs are used. Generally, a linear motion guideway has a negative clearance between groove and balls in order to improve stiffness and maintain high precision.The fiqure shows the load is multiplied by the preload the rigidity is doubled and the deflection is reducedby one half. The preload no larger than ZA would be recommended for the model size under HG20 to avoid an over-preload affecting the quideway's life.
PYG offers three classes of standard preload for various applications and conditions. The preload classes shown below:
Post time: Oct-11-2024
