How to find the right Linear Motion Ball Splines AI guide

THK: The best-known ball spline maker, with a wide range of nut types.
NB (Nippon Bearing): Offers ball and stroke splines in many sizes.
IKO: Makes ball splines alongside its other linear guide products.
KSS: Japanese maker known for miniature ball screw and spline combinations.
Misumi: Offers configurable shaft lengths and end machining.

Written by an AI model from its trained knowledge.

What the AI looks for in Linear Motion Ball Splines

Torque and load rating: Size the spline by its rated torque and radial load together, using the maker's combined-load life calculation. A ball spline's job is to transmit torque while it slides, so it is sized on both torque and load, unlike a plain linear bushing.
Shaft diameter and length: Choose the diameter from load, torque and unsupported length, and check deflection and critical speed for long shafts. A thin shaft that is long and supported only at its ends deflects and whips at speed.
Rotational clearance and preload: Specify a preloaded nut wherever the torque reverses or angular backlash matters. Clearance in the nut shows up as angular play, which ruins indexing accuracy and pick-and-place repeatability.
Nut style: Choose flanged nuts for face mounting and cylindrical nuts for housing bores. Pick a rotary-type nut with an integrated bearing if the nut itself must rotate. The nut style sets how the spline integrates into the machine, and it is hard to change later.
Shaft type: Use a hollow shaft when air, vacuum or wiring must pass through it, and a solid shaft for maximum stiffness. Vacuum pick-up heads commonly route air through a hollow spline shaft.

Using a keyed shaft or plain bushing where smooth sliding under torque is required
Mixing nuts and shafts from different makers or series
Mounting the nut so that misalignment twists it off-axis

Only if you also need anti-rotation or torque transfer. Otherwise round shafting with linear bushings is simpler and cheaper.