Ball Screw vs Lead Screw : A ball screw is a mechanical device that translates rotational motion to linear motion. Ball screws are typically 90% efficient at converting input torque to thrust. Compared to lead screws, ball screws are generally more bulky, because of the need to have a mechanism to re-circulate the balls. Typically, their design allows for multiple repair options to extend the life of the ball screw without full replacement.
Brinelling : A form of mechanical damage in which metal is displaced or upset without attrition. It is a permanent deformation of the ball track. Brinelling usually results from excessive load. This is an indication of material surface fatigue, usually indicating the end of life, may be able to be removed with regrind option depending on amount/depth. If the ball screw has not reached its expected life, this may be a sign of overload or an indication that the ball screw is experiencing radial loads.
Circuit : The closed path of recirculating balls in a nut.
Compression Load : A load that would tend to buckle or compress the ball screw shaft.
Critical Speed : The angular velocity at which the screw (or nut) develops severe vibrations.
Cycle : The complete forward and reverse motion of the screw (or nut) in moving the load.
Deadband : The range through which a nut can be turned without engaging the balls.
Dynamic Load : The maximum load that a ball screw assembly can maintain for a prescribed length of travel.
Galling : A condition whereby excessive friction between high spots results in localized welding with subsequent splitting and a further roughening of rubbing surfaces of one or both of two mating parts. This is an indication of material surface fatigue, usually indicating the end of life, may be able to be removed with regrind option depending on amount/depth.
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