Study on the Mathematical Model of Japanese Rotary Blades for Computer Aided Design (CAD)

(Part 1) Blade-tip and edged curve portions

Abstract

Many methods are available for the design of Japanese rotary baldes (Nataba). Employing mathematical model for CAD (Computer Aided Design) on both the results of authers' research and the other obtained in past 20 years, the 29 parameters are selected in order to design the Japanese rotary blade. The main design parameters can be distinguished as the form of holder, neck portion, edged curve and also durability, outward appearance and heat treatment.
These design parameters are then substituted into the theoretical equations following the human logical process. The developed flow-chart can be adapted as a general language and the program for drawing the rotary blade by the use of X-Y plotter with a micro-computer is developed too.
In this paper, the mathematical models of a blade-tip and an edged curve portions are presented under the manufacturing method and tillage conditions of Japanese rotary blades.
The other parts and the completed drawing of bladess will be reported in next papers.