The ball screw pre-pull and pretensioners amount

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    Screw pretensioners with the lock nut of the screw at both ends of the assembly on the direction of the length of the screw required to exert a certain pull to adjust the screw both nut reverse tight, because when the t emperature rise of the screw in the operation, the thermal stress effects will screw elongation,bearing roller bearings the length of the screw to become unstable. The purpose is to effectively eliminate the components of the elastic variables in order to obtain a smooth motion accuracy. When a saddle or bench damping force is greater than the elastic torque of the screw and nut or micro feed worktable is not shifted, with the feed screw and nut accumulated elastic torque exceeds the table damping torque at this time workbench impulse displacement. Although the total amount of feed may not be affected, but the actual number of steps, each step into to the amount of the controller output error, the consequences are serious impact on machining accuracy.ball roller bearing
    ; Large pre-pull will burn support bearings recommended the pretensioners value less than 5 ℃ in this, but it is more than 50mm in diameter of the ball screw are not suitable for pre-pull screw diameter need to pre-tension, this will lead to bearing heat and burn. Therefore recommended that the 3 ° C temperature rise as a benchmark of compensation for the value of T (screw every 1000mm,-0.02-- 0.03mm).roll bearings