Hamachi and Munemachi Finishing Techniques: The Precision Grinding and Hammering That Defines the Blade-Tang Boundary After Quenching

The hamachi (edge notch) and munemachi (back notch) are critical boundary areas between the blade body and tang of a Japanese sword. This article details the precision finishing processes required after quenching, including distortion correction, shape refinement, and the careful fitting with the habaki collar.