Even the most mundane tools may bring forth complex truths in microgravity. On October 20, 2025, a set of small metal ball ...

Grease both lubricates and keeps contaminants out of bearings. But its job is often made difficult by back-and-forth, or oscillatory, motion. Printing presses are a classic example: Frequent returns ...

Any motion which repeats itself at regular intervals of time is known as periodic motion. If a body moves back and forth repeatedly about its mean position then it is said to be in oscillatory motion.

Oscillating motion can quickly destroy even over-sized bearings. Understanding and treating the problem, rather than the symptoms, is the cure. Grease both lubricates and keeps contaminants out of ...