rotary parts 2

https://themazdarx7s1central.meridiannest.com/posts/understanding-the-mazda-rx-7-s1-a-look-at-the-first-generation-rotary-icon

You know that satisfying hum when a fan spins or the smooth rotation of a bike wheel? That's rotary parts in action, the cogs, bearings, and shafts that keep things moving efficiently. Without them, machinery would just grind to a halt, and even simple tasks like opening a jar would be a chore.