Tool Designation

1. ASA System
2. ORS System
3. NRS System

•ASA System - ∝_b  - ∝_s-θ_e-θ_s-C_e-C_s-r

                            6 --  4 --  8 ---7   --- 25 – 35 --- 0.2

This system is preferable because the angles are measured with 

respect to three mutually perpendicular planes

•

ORS System - i - ∝_ -θ_e^′-θ_s^′-C_e-λ-r

Where i = inclination angle

   ∝ =side rake angle or orthogonal rake or effective rake

   λ = approach angle or entering or principle cutting edge

•