Place a recirculating-ball bushing on a shaft and what do you get? Frictionless movementof the shaft.But, create grooves along the axial length of the shaft that correspond to the radius of the bushing’sball elements and you’ve got frictionless linear movement coupled with two importantcharacteristics – those being anti-rotation torque transfer and higher load capabilities.Now… that’s a ball spline. It combines a linear bushing (nut) that can now handle greatermoment loads and, a shaft, which, unlike a rail, can be rotated when needed. It is perfect forhigh-speed motion and high-speed rotation.

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NB Corp of America