Influence of Tool Geometry

Angles Conversion from ASA to ORS

Conversion of ASA to ORS of first two angles i.e α_b,α_s

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

•

Single Point Cutting Tool

∝_b=Back rake aangle

∝_s=Side rake angle

θ_e=End relief angle

θ_s=Side relief angle

C_e=End cutting angle

C_s=Side cutting angle

These are called basic angles

Nose angle, lip angle, cutting angle are called derived angles

GATE 2015-Machining, Machine Tool Operations

GATE 2015-Syllabus of Machining, Machine Tool Operations

Mechanics of machining, single and multi-point cutting tools, tool geometry and materials, tool life and wear; economics of machining; principles of non-traditional machining processes; principles of work holding, principles of design of jigs and fixtures. Machining, Machine Tool Operations (want notes for this ??) click on the link