## Machinability Index Solution

STEP 0: Pre-Calculation Summary
Formula Used
Machinability Index of a Material = Cutting Velocity*100/Cutting Speed of Free-Cutting Steel
I % = V*100/Vs
This formula uses 3 Variables
Variables Used
Machinability Index of a Material - Machinability Index of a Material is used to compare the machinability of different materials by quantifying the relative machinability of a different materials.
Cutting Velocity - (Measured in Meter per Second) - The Cutting Velocity is the tangential velocity at the periphery of the cutter or workpiece (whichever is rotating).
Cutting Speed of Free-Cutting Steel - (Measured in Meter per Second) - Cutting Speed of Free-Cutting Steel is the speed of cutting used when operating on a standard workpiece made of Standard Cutting Steel.
STEP 1: Convert Input(s) to Base Unit
Cutting Velocity: 10 Meter per Second --> 10 Meter per Second No Conversion Required
Cutting Speed of Free-Cutting Steel: 40 Meter per Minute --> 0.666666666666667 Meter per Second (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
I % = V*100/Vs --> 10*100/0.666666666666667
Evaluating ... ...
I % = 1500
STEP 3: Convert Result to Output's Unit
1500 --> No Conversion Required
1500 <-- Machinability Index of a Material
(Calculation completed in 00.003 seconds)
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## Credits

Created by Kumar Siddhant
Indian Institute of Information Technology, Design and Manufacturing (IIITDM), Jabalpur
Kumar Siddhant has created this Calculator and 400+ more calculators!
Verified by Parul Keshav
National Institute of Technology (NIT), Srinagar
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## < 11 Tool Life and Tool Wear Calculators

Tool temperature
Tool Temperature = (Constant for tool temperature*Specific Cutting Energy per unit Cutting Force*Cutting Velocity^0.44*Area of cut^0.22)/(Thermal Conductivity^0.44*Specific Heat Capacity of work^0.56)
Taylor's Exponent given Cutting Velocities, Tool Lives for two Machining Conditions
Taylor's Tool Life Exponent = (-1)*ln(Cutting Velocity/Reference Cutting Velocity)/ln(Tool Life/Reference Tool Life)
Tool Life given Cutting Velocities and Tool Life for Reference Machining Condition
Tool Life = Reference Tool Life*((Reference Cutting Velocity/Cutting Velocity)^(1/Taylor's Tool Life Exponent))
Reference Tool Life given Cutting Velocities, Tool Life under Machining Condition
Reference Tool Life = Tool Life/((Reference Cutting Velocity/Cutting Velocity)^(1/Taylor's Tool Life Exponent))
Taylor's Tool Life Exponent given Cutting Velocity and Tool Life
Taylor's Tool Life Exponent = ln(Taylor's Intercept or Taylor's Constant/Cutting Velocity)/Tool Life
Taylor's Exponent if ratios of Cutting Velocities, Tool Lives are given in two machining conditions
Taylor's Tool Life Exponent = (-1)*ln(Ratio of Cutting Velocities)/ln(Ratio of Tool Lives)
Taylor's Tool Life given Cutting Velocity and Intercept
Tool Life = (Taylor's Intercept or Taylor's Constant/Cutting Velocity)^(1/Taylor's Tool Life Exponent)
Taylor's Intercept given Cutting Velocity and Taylor's Tool Life
Taylor's Intercept or Taylor's Constant = Cutting Velocity*(Tool Life^Taylor's Tool Life Exponent)
Machinability Index
Machinability Index of a Material = Cutting Velocity*100/Cutting Speed of Free-Cutting Steel
Feed for Sintered-Carbide Tools using Crater Depth
Feed Rate = (Tool Wear Crater Depth-0.06)/0.3
Crater Depth for Sintered-Carbide Tools
Tool Wear Crater Depth = 0.06+0.3*Feed Rate

## Machinability Index Formula

Machinability Index of a Material = Cutting Velocity*100/Cutting Speed of Free-Cutting Steel
I % = V*100/Vs

## Machinability under different Machining Operation.

The rated machinability may vary for different cutting operations such as turning, milling, forming, etc. In order to find the machinability index, factors like tool material, tool geometry, tool life, and other cutting conditions are fixed except the speed. Then the speed at which the tool cuts the material is found for pre-determined tool life. Then it is compared with standard material.

## How to Calculate Machinability Index?

Machinability Index calculator uses Machinability Index of a Material = Cutting Velocity*100/Cutting Speed of Free-Cutting Steel to calculate the Machinability Index of a Material, The Machinability Index is defined as the percentage ratio of Cutting Velocity on the material to that used on a Standard Free-Cutting Steel. It is usually calculated for an average speedof Cut spread over a time span of 20 min. Machinability Index of a Material is denoted by I % symbol.

How to calculate Machinability Index using this online calculator? To use this online calculator for Machinability Index, enter Cutting Velocity (V) & Cutting Speed of Free-Cutting Steel (Vs) and hit the calculate button. Here is how the Machinability Index calculation can be explained with given input values -> 1500 = 10*100/0.666666666666667.

### FAQ

What is Machinability Index?
The Machinability Index is defined as the percentage ratio of Cutting Velocity on the material to that used on a Standard Free-Cutting Steel. It is usually calculated for an average speedof Cut spread over a time span of 20 min and is represented as I % = V*100/Vs or Machinability Index of a Material = Cutting Velocity*100/Cutting Speed of Free-Cutting Steel. The Cutting Velocity is the tangential velocity at the periphery of the cutter or workpiece (whichever is rotating) & Cutting Speed of Free-Cutting Steel is the speed of cutting used when operating on a standard workpiece made of Standard Cutting Steel.
How to calculate Machinability Index?
The Machinability Index is defined as the percentage ratio of Cutting Velocity on the material to that used on a Standard Free-Cutting Steel. It is usually calculated for an average speedof Cut spread over a time span of 20 min is calculated using Machinability Index of a Material = Cutting Velocity*100/Cutting Speed of Free-Cutting Steel. To calculate Machinability Index, you need Cutting Velocity (V) & Cutting Speed of Free-Cutting Steel (Vs). With our tool, you need to enter the respective value for Cutting Velocity & Cutting Speed of Free-Cutting Steel and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
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