Avoid Common Mistakes. See How These 2 Differ.

From a pure performance standpoint, self-aligning bushings can have a top speed of 10 ft/sec (3 m/sec). 

What makes self-aligning bushings particularly suited for certain applications is that they can safely move at higher speeds than standard bushings, can carry higher loads, and are self-aligning, letting them absorb some machining and mounting errors.



These capabilities make them commonly used in factory automated equipment, machine tools, industrial machines, electrical equipment, optical and measuring instruments, and any linear-motion application that needs precision, light weight, speed, durability, and low cost.

Ball splines, on the other hand, can travel up to about 5 ft/sec (1.5 m/sec). 

Ball splines are chosen by engineers for linear motion partly because they handle torque transmission (or resist twisting moments). Any application that involves linear movement but also requires the angular position to be controlled (or kept fixed) benefits from ball splines. 

Ball splines are commonly used in robots that perform pick-and-place operations because they combine the angular control with linear motion. They are also popular for assembly, welding, riveting, and tool changing and are commonly found in equipment for inspection and measurement, die setting and molding, moving and loading, spinning and winding, and coating and plating. 

The Advantages of a Perfect FIT

Our FIT Series of slide bush and shaft assemblies optimize clearance between shaft and bush. NB's precision manufacturing assures customers of the best clearance. FIT saves the time and money of designing in clearance adjustable housings for standard slide bush, slide rotary bush or stroke bush.

Due to the combined tolerances of a bush’s bore and a shaft’s diameter, accuracy can be affected by increased dynamic friction caused by preloading (clearance). Minute differences in preloading (see accompanying illustration of Radial Clearance between Slide Bush and Shaft) are difficult and time consuming to adjust. In some extreme cases, designs have been sacrificed to sidestep this problem - resulting in higher component production costs.

NB’s FIT Series of slide bush and shaft assemblies optimize clearance between shaft and bush. NB's precision manufacturing assures customers of the best clearance for their needs.

There is no need to accept maximum clearances of + 17 microns when NB’s FIT series offers just + 4 microns.

Shaft end placement deviation is reduced 70% from the standard 0.046mm when compared with the FIT Series which is only 0.011mm.

Quick and Easy – Find allowable load

Customer Quote of the Month

"Any bearing wears out over time - and everything wears out - it is so easy to replace the bearings inside an NB pillowblock as opposed to the competition. With NB. all you do is take four fasteners off the bottom, remove a skip plate and the old bearing slides out. You put the new bearing in place, put four fasteners back in and you're off and running again."

How Do These Rotary Ball Splines Differ?

NB's SPB Rotary Ball Spline nut consists of a spline nut and a rotating portion using balls in the SPB.

NB's SPR Rotary Ball Spline nut consists of a spline nut and a rotating portion using crossed rollers in the SPR.

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