Ball Screw Back Drive

Though ball screws provide accurate positioning they are susceptible to back driving.

Ball screw back drive. Determining if a screw will back drive is relatively simple. And if the lead of the screw is small the assembly will be even less likely to back drive. I do agree about chatter causing them to move though both ball and acme are prone to that but its not so much the loading but the vibration effectively nearly totaly unloading then loading the screw that seams to do it even a very light chattering cut can some times move a acme on good free running slides. A rule of thumb to prevent back driving is to use a lead that is less than 1 3 the diameter of the screw on the other hand the high efficiency of a ball screw drive makes it more likely than a lead screw to back drive in a vertical application.

Hiwin ball screw product video. A ball screw is a mechanical linear actuator that translates rotational motion to linear motion with little friction a threaded shaft provides a helical raceway for ball bearings which act as a precision screw. Back driving torque is based on the axial load the screw lead and the screw s efficiency. 5mm pitch ball screws on a bridgeport mill won t back drive.

Ball screw back driving calculation lintech manufactures standard positioning actuators systems stages and slides. Brakes beat ball screw back drive. As well as being able to apply or withstand high thrust loads they can do so with minimum internal friction. How back driving is prevented in industrial linear actuators ila thomson industries inc.

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