I am currently working through a series of posts to help shed light on some of the more challenging points of classical tanto geometry.
As a starting point, consider kata, a traditional method of creating exact pattern templates based on the works of the masters. Using mild steel in a thickness of about 1.5mm, the outlines of a historical work are carefully studied and reproduced, as accurately as possible.
Creating kata serves as a focused study of the subtle details of blade design and is a solid foundation for works of a similar or derivative style.
Learn more about kata and see an example based on a beautiful and well-known antique tanto, the Aizu Shintogo: islandblacksmith.ca/2014/04/aizu-shintogo-kunimitsu-tanto-kata