Niloch – thank you for pointing me to a memorable experience. I imagine most members of this forum would be struck by the absence of machine work; Ironbrush says he rejects machines as being too quick. I did, however, notice what looked like a motorised fret saw in one shot and, of course, he is understandably using optical and computer technology, which was possibly not available to the original artist. These wonderful videos say a good deal about Japan.
The saucepan technique reminded me of how lead shot are made.
Two questions (which may be answered by his other videos): was periodic annealing required and how does he sharpen those chisels?