Zero to Ha-ganna – As a tsunami of interest in the Japanese art of Kumiko rises worldwide, so too does interest in one of its most desirable, mysterious, and rare mass-production tools: the Ha-ganna. The Ha-ganna is a custom V-groove plane developed to speed production of the thousands of identical in-fill pieces these “wood-placement” kumiko patterns can require. Authors Robert Schneider and Glen M. Wilson aim to demystify the tool, providing an entry point to understanding its elegance, as you decide to either purchase or make your own Ha-ganna. The book ably combines theory and practice. Real-world lessons merge with exquisite mathematical explanations. Heavily illustrated chapters emphasize understanding the tool – from physical construction to geometric relationships – as well as diving into DIY construction processes, and sharpening. The book is accompanied by spreadsheet formulas that simply resolve one of the most vexing problems facing every Ha-ganna user – the sharpening angle, made complex by the 3-D nature of a V shaped blade. Zero to Ha-ganna fills a gap in available literature, and is destined to become an essential in the library of any kumiko maker, blacksmith, or woodworker interested in Japanese tools.