Machinability Index Calculator

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✖The Cutting Velocity is the tangential velocity at the periphery of the cutter or workpiece (whichever is rotating).ⓘ Cutting Velocity [V]			+10% -10%
✖Cutting Speed of Free-Cutting Steel is the speed of cutting used when operating on a standard workpiece made of Standard Cutting Steel.ⓘ Cutting Speed of Free-Cutting Steel [V_s]			+10% -10%

✖Machinability Index of a Material is used to compare the machinability of different materials by quantifying the relative machinability of a different materials.ⓘ Machinability Index [I %]

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Formula

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Machinability Index

Formula

`"I %" = "V"*100/"V"_{"s"}`

Example

`"1500"="10m/s"*100/"40m/min"`

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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/V_s
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/V_s --> 10*100/0.666666666666667

Evaluating ... ...

I % = 1500

STEP 3: Convert Result to Output's Unit

1500 --> No Conversion Required

FINAL ANSWER

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

Parul Keshav has verified this Calculator and 400+ more calculators!

< 11 Tool Life and Tool Wear Calculators

Tool temperature

Go 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

Go 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

Go 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

Go 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

Go 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

Go 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

Go 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

Go Taylor's Intercept or Taylor's Constant = Cutting Velocity*(Tool Life^Taylor's Tool Life Exponent)

Machinability Index

Go Machinability Index of a Material = Cutting Velocity*100/Cutting Speed of Free-Cutting Steel

Feed for Sintered-Carbide Tools using Crater Depth

Go Feed Rate = (Tool Wear Crater Depth-0.06)/0.3

Crater Depth for Sintered-Carbide Tools

Go 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/V_s

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 (V_s) 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/V_s 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 (V_s). 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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