Currently, he only has clay to make the molds.
He has high-quality clay brought from Mount Jinshui, extremely heat-resistant, and it won't bond with molten iron. Once the cast iron is removed, the clay mold itself remains undamaged.
He once spent countless efforts searching for various chemicals.
Simple items can be cast using this kind of mold.
For processing metal parts, he knows he also needs equipment like lathes, planers, and milling machines.
But he has only heard their names, not knowing what they actually look like, let alone understanding their principles.
Previously, to make cylindrical objects, he tried a polishing device driven by a bowstring.
Two people would vigorously pull the bowstring back and forth, causing a stick to rotate rapidly.
Another person, holding a chisel or similar tool, could then work on the stick, making it rounder.
The serious problem he encountered was that the axle would wobble when the device rotated.
Unstable.
