Step inside the world of heavy industry and traditional craftsmanship in 20 Minutes of Powerful Factory Machines and Satisfying Production Processes #18.

In this episode, you’ll see how giant slewing bearings are forged and machined to carry enormous rotating loads, how tunnel-boring machine cutters are built with hardened steel, tungsten-carbide inserts, and precision bearings, and how an experienced craftsman transforms spring steel into a sharp hand saw.

The journey then moves into traditional Korean metalworking, where molten copper alloys are poured into sand molds to create brass cups and handcrafted bronze kettles. From forging, CNC machining, carbide fitting, and precision grinding to sand casting, polishing, and careful hand finishing, every process reveals a different combination of machinery, engineering, and human skill.

Which process impressed you the most? Let us know in the comments.

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