Rotary Ball Spline SPR
You can use NB rotary ball splines in many applications requiring linear and/or rotational motion, such as automatic tool changers, SCARA robots and pick-and-place assembly equipment. Their unique design features a spline nut with a rotating portion that moves via cross rollers. This configuration offers many advantages, including high accuracy and a substantial reduction in installation costs.
Key Features At-a-Glance
NB ball splines provide linear and rotational motions using a combination of spline nut and rotary cross roller bearing design. Splines feature arch-shaped grooves on both the shaft and inner portion of the cylinder. These grooves approximate the diameter of the ball bearings, allowing them to carry a high load in a linear motion. Notable features of this type of design include:
Increased load capacity
The rotary to linear mechanism of NB ball splines can typically handle 10 times the load of conventional ball bushings, which only maintain a single point of contact at any given time.
Greater travel life
By utilizing the large ball contact surface of arch-shaped grooves, travel life is extended by up to 700 times (compared to conventional ball bushings).
Fewer number of parts
Similarly, by providing both linear and rotational motions, NB ball splines effectively perform the work of two components. In addition to allowing for smaller devices, this also minimizes the number of parts required, which saves you money and reduces maintenance requirements.
Increased opportunities for miniaturization
NB ball splines feature a single-axis configuration that, when compared to the dual-axes system of most ball bushings, allows for smaller and lighter systems overall.
High Accuracy
NB ball splines’ cross rollers provide exceptional accuracy in any application in which precision is a necessity.
Higher rigidity
The compact design of NB ball splines doesn’t come at the expense of rigidity, thanks to their four-row ball circuit structure.
