STRUCTURE AND ADVANTAGES The NB ROTARY BALL SPLINE SPB type combines a spline nut and a set of angular contact bearings in a compact, high accurate, and high-speed rotation-capable assembly, providing both linear and rotational motion at the same time. Structure of SPB type
The amount of clearance and preload for the spline nut is expressed in terms of the clearance in the rotational direction. Three levels of preload are available: standard, light( T1), and medium( T2).
The preload is properly adjusted by the spacer for the angular contact bearings.
Table 1 Preload and Clearance in Rotational Direction( Linear Motion) unit/μm
part number standard light(T1) medium(T2)
SPB16 －3~＋1 －8~－3 －13~－8
SPB20 －4~＋2 －12~－4 －20~－12
SPB25
Table 2 Operating Conditions and Preload
preload symbol operating conditions
standard blank minute vibration is applied. a precise motion is required. a torque is applied in a given direction.
light T1 slight vibration is applied. slight torsional load is applied. cyclic torque is applied.
medium T2 shock/vibration is applied. over-hang load is applied. torsional load is applied.
※HANDLING PRECAUTION
The spacer is adjusted to give a proper spacing for the best preload condition. Please do not adjust the spacer.
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