✖The Cut Velocity is the tangential velocity at the periphery of the cutter or workpiece (whichever is rotating).ⓘ Cut Velocity [V_cut]			+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"_{"cut"}*100/"V"_{"s"}`

Example

`"124.7499"="0.831666667m/s"*100/"0.666667m/s"`

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Machinability Index Solution

STEP 0: Pre-Calculation Summary

Formula Used

Machinability Index of A Material = Cut Velocity*100/Cutting Speed of Free-Cutting Steel
I = V_cut*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.
Cut Velocity - (Measured in Meter per Second) - The Cut 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

Cut Velocity: 0.831666667 Meter per Second --> 0.831666667 Meter per Second No Conversion Required
Cutting Speed of Free-Cutting Steel: 0.666667 Meter per Second --> 0.666667 Meter per Second No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

I = V_cut*100/V_s --> 0.831666667*100/0.666667

Evaluating ... ...

I = 124.749937675031

STEP 3: Convert Result to Output's Unit

124.749937675031 --> No Conversion Required

FINAL ANSWER

124.749937675031 ≈ 124.7499 <-- Machinability Index of A Material

(Calculation completed in 00.004 seconds)

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Home » Engineering » Production Engineering » Metal Machining » Machine Tools and Operations » Tool Life and Tool Wear » Cutting Velocity » Machinability Index

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Indian Institute of Information Technology, Design and Manufacturing (IIITDM), Jabalpur

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< 13 Cutting Velocity Calculators

Cutting Velocity for given Taylor's Tool Life

Go Cut Velocity = Taylors Intercept or Taylor's Constant/((Tool Life in Cutting Velocity^Taylors Tool Life Exponent in Cutting Velocity)*(Feed Rate in Cutting Velocity^Taylors Exponent For Feed Rate in Cutting Velocity)*(Cut Depth^Taylor's Exponent in Cutting Velocity))

Taylor's Exponent given Cutting Velocities, Tool Lives for two Machining Conditions

Go Taylors Tool Life Exponent in Cutting Velocity = (-1)*ln(Cut Velocity/Reference Cutting Velocity in Cutting Velocity)/ln(Tool Life in Cutting Velocity/Reference Tool Life in Cutting Velocity)

Reference Cutting Velocity given Tool Lives, Cutting Velocity under Machining Condition

Go Reference Cutting Velocity in Cutting Velocity = Cut Velocity/((Reference Tool Life in Cutting Velocity/Tool Life in Cutting Velocity)^Taylors Tool Life Exponent in Cutting Velocity)

Cutting Velocity given Tool Lives and Cutting Velocity for Reference Machining Condition

Go Cut Velocity = Reference Cutting Velocity in Cutting Velocity*(Reference Tool Life in Cutting Velocity/Tool Life in Cutting Velocity)^Taylors Tool Life Exponent in Cutting Velocity

Taylor's Intercept given Cutting Velocity and Taylor's Tool Life

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

Cutting Velocity using Taylor's Tool Life and Intercept

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

Cutting Velocity for given Tool Life and Volume of Metal Removed

Go Cut Velocity = Volume of Metal Removed/(Tool Life in Cutting Velocity*Feed Rate in Cutting Velocity*Cut Depth)

Resultant Cutting Velocity

Go Resultant Cutting Velocity = Cutting Velocity/cos((Cutting Speed Angle))

Cutting Speed of Free-Cutting Steel given Cutting Velocity of Tool and Machinability Index

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

Cutting Velocity using Machinability Index

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

Machinability Index

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

Feed for Sintered-Carbide Tools using Crater Depth

Go Feed Rate in Cutting Velocity = (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 in Cutting Velocity

Machinability Index Formula

Machinability Index of A Material = Cut Velocity*100/Cutting Speed of Free-Cutting Steel
I = V_cut*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 = Cut 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 Cut Velocity (V_cut) & 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 -> 124.75 = 0.831666667*100/0.666667.

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_cut*100/V_s or Machinability Index of A Material = Cut Velocity*100/Cutting Speed of Free-Cutting Steel. The Cut 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 = Cut Velocity*100/Cutting Speed of Free-Cutting Steel. To calculate Machinability Index, you need Cut Velocity (V_cut) & Cutting Speed of Free-Cutting Steel (V_s). With our tool, you need to enter the respective value for Cut 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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