The variable stiffness of a standard belt drive is a considerable challenge when aiming to accurately convert rotational motion to linear motion.

But the physics of rotational motion isn't all that different from the physics of translational motion. It still involves things like position, velocity, and acceleration.

Roh'lix linear actuators consist of three precision ball bearings at each end of a two-piece aluminum carrier block. Mounted at an angle to the drive axis, the six bearings convert drive shaft ...

Furthermore, experiments and numerical computer simulations have demonstrated that the brain is more sensitive to rotational motion than linear motion in regard to concussions.