In this video, the maker builds a "cumai" katana by using twisted damascus steel, copper, and 1084 steel. The process involves various steps such as forging, twisting, grinding, heat treating, and wrapping the handle. The finished product has steel fittings that are blackened using hot salt, and a scabbard with padding to protect the blade. The maker adds his maker's mark on the tang and engraves "Tyrell Knifeworks" in Japanese on the other side. The video concludes with the finished product being presented.
1. Building a "cumai" katana
2. The outer cladding of the sword is made of twisted damascus using 1095 and 15n20 steels
3. Starting billet is made of 1095 and 15n20 steel and is heated and squished together to set the weld
4. Bars are re-squared and twisted, then flattened to create a wavy pattern
5. The blade is heated and quenched, then tempered to bring down its hardness
6. The handle is made out of basswood and decorated with copper fittings, stingray skin, and menuki (copper sharks)
7. The fittings are blackened with hot salts
8. The blade is acid-etched and coated with hot coffee to make it black
9. The scabbard is made and shaped, and is painted black
10. The finished product is revealed.