Introduction
An interactive 3D model of a spur gear.
Additional Resources
https://www.motioncontroltips.com/spur-gears-what-are-they-and-where-are-they-used
https://en.wikipedia.org/wiki/Spur_gear
https://www.grobinc.com/spur-gears
https://khkgears.net/new/gear_knowledge/introduction_to_gears/types_of_gears.html