Homemade Sphere Machine Actually Works, Turns Rocks Into Perfect Spheres
SMRTR summary
Rob from Michigan Rocks created a homemade sphere machine using three $12 battery-powered drills with diamond-tipped bits that press against rocks from different angles, transforming rough beach stones into perfect glass-like spheres. The DIY device, inspired by a YouTube design but made more accessible than expensive commercial versions, uses water cooling and progressively finer diamond polishing pads over several hours to reveal stunning patterns in ordinary rocks.
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