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Rotary Ball Spline Technologies And The Effective Differences of Two Rotational Nut Technologies

From NB Corporation of America

riding
on angular contact ball bearings or crossed roller bearings?" After ascertaining your application's
requirements - stroke length; velocity; applied load; mounting space; duty cycle; required
life; dimensions; installation direction; environment and accuracy - you're ready to factor in the
pros and cons of the two technologies.
If you are considering a rotary ball spline, you know that in addition to a ball spline's forte
- transference of torque - the rotary ball spline adds a nut that rotates on the ball spline shaft
making the unit capable of simultaneous linear and rotary motion with sub-millimeter accuracy.
These linear and rotational capabilities would seem perfectly suited to a multitude of automation
applications. However, design considerations make choosing which kind of rotary ball
spline critical, i.e., whether the rotational nut rides on angular contact ball bearings or crossed
roller bearings.

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Products & Services
Linear Slides and Linear Stages
Linear slides are simple linear motion devices composed of a stationary base and a moving carriage. Linear stages are slides with a drive mechanism that provide controlled, precise positioning along a linear axis.
Ball Splines
Ball splines provide nearly friction-free linear motion while simultaneously transmitting torsional loads. The path of the bearing balls is straight, not helical, which allows for a very efficient coupling device suitable for a variety of applications.
Ball Slides
Ball slides are simple linear motion devices that provide smooth linear motion, accurately controlled by the rotation of the drive mechanism. 
Crossed Roller Slides
Crossed roller slides are simple linear motion devices that consist of a stationary base and a moving carriage. The rollers are crossed at a 90° angle in an alternating fashion and are enclosed in the rails, which have a machined V-shaped groove to support the rollers.
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