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Determine the theoretical surface roughness that can be achieved per a given pair or insert corner radius and feedrate.Power Tip – Below is a simple calculator with basic explanations. For advanced surface finish calculators with detailed explanations, Go HereFn – Feedrater – Corner RadiusRa – Surface FinishToggle mm / InchOther CalculatorsPayment options Payment options TheoryThe surface roughness of the turning operation depends on the feedrate and the insert corner radius. A lower feedrate improves the surface finish, as does a larger corner radius.Power Tip – The feedrate is squared in the formula and therefore has a more significant influence. When you need to improve the surface quality, start by reducing the feedrate$ \large R_a = K \times \huge \frac {F_n^{2}}{r} $$ \normalsize \text {(K is a constant that depends on the units used)} $This formula provides the best theoretical surface finish at optimal conditions. The actual surface quality depends on additional factors such as stability and cutting edge wear.Formula in metric unitsFn – Feed rate [mm/rev]r – Corner Radius[ mm]Ra – Surface Finish [μ]$ \large R_a = 46 \times \huge \frac {F_n^{2}}{r} $Formula in Imperial unitsFn – Feed rate [IPR]r – Corner Radius [Inch]Ra – Surface Finish [μ Inches]$ \large R_a = 31,675 \times \huge \frac {F_n^{2}}{r} $

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The turning inserts catalog or our experience tells us the cutting speed we need to use for a given application. On the other hand, the CNC lathe is limited by its maximum spindle speed. Therefore it is common that we need to compute the spindle speed out of a given cutting speed to ensure that the speed we want to run at is within the machine’s limit. It is calculated by dividing the cutting speed by the turned diameter circumference.Important Note: Pay attention that the diameter d is the smallest diameter in the operation. In external turning, it is smaller than the outer diameter, and in internal turning, it is larger than the inner diameter!$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large n= \huge \frac{V_c}{C} $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large n = \huge \frac{1000 \times V_c}{\pi \times d} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $

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This Material Removal Rate Calculator enables users to calculate the MRR based on width of cut, depth of cut, and feed rate—key for optimizing productivity and ...

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However, in most cases, we know the cutting speed, not the spindle speed. If we substitute n with the spindle speed formula, we can calculate the machining time directly:$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $$ \normalsize \text {(in mentric units the constant 12 shoud be repalced with 1,000)} $Important Note: If you use the formula based on cutting speed, you must ensure that the speed is not limited by the machine’s maximum RPM. If that is the case, use the formula based on the spindle speed!Formula in metric unitsFn – Feedrate [mm/rev]Vc – Cutting Speed [m /min]d – Turned Diameter [mm]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{1000 \times F_n \times V_c} $Formula in Imperial unitsFn – Feedrate [IPR]Vc – Cutting Speed [SFM]d – Turned Diameter [Inch]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $

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Hence the cutting time is the length divided by the linear speed:$ \large T = \huge \frac{l}{V_f} = \frac{l}{F_n \times n}$However, in most cases, we know the cutting speed, not the spindle speed. If we substitute n with the spindle speed formula, we can calculate the machining time directly:$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $$ \normalsize \text {(in mentric units the constant 12 shoud be repalced with 1,000)} $Important Note: If you use the formula based on cutting speed, you must ensure that the speed is not limited by the machine’s maximum RPM. If that is the case, use the formula based on the spindle speed!Formula in metric unitsFn – Feedrate [mm/rev]Vc – Cutting Speed [m /min]d – Turned Diameter [mm]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{1000 \times F_n \times V_c} $Formula in Imperial unitsFn – Feedrate [IPR]Vc – Cutting Speed [SFM]d – Turned Diameter [Inch]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $

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$ \large R_a = K \times \huge \frac {F_n^{2}}{r} $$ \normalsize \text {(K is a constant that depends on the units used)} $This formula provides the best theoretical surface finish at optimal conditions. The actual surface quality depends on additional factors such as stability and cutting edge wear.Formula in metric unitsFn – Feed rate [mm/rev]r – Corner Radius[ mm]Ra – Surface Finish [μ]$ \large R_a = 46 \times \huge \frac {F_n^{2}}{r} $Formula in Imperial unitsFn – Feed rate [IPR]r – Corner Radius [Inch]Ra – Surface Finish [μ Inches]$ \large R_a = 31,675 \times \huge \frac {F_n^{2}}{r} $

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$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $$ \normalsize \text {(in mentric units the constant 12 shoud be repalced with 1,000)} $Important Note: If you use the formula based on cutting speed, you must ensure that the speed is not limited by the machine’s maximum RPM. If that is the case, use the formula based on the spindle speed!Formula in metric unitsFn – Feedrate [mm/rev]Vc – Cutting Speed [m /min]d – Turned Diameter [mm]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{1000 \times F_n \times V_c} $Formula in Imperial unitsFn – Feedrate [IPR]Vc – Cutting Speed [SFM]d – Turned Diameter [Inch]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $

$ \large T = \huge \frac{l}{V_f} = \frac{l}{F_n \times n}$However, in most cases, we know the cutting speed, not the spindle speed. If we substitute n with the spindle speed formula, we can calculate the machining time directly:$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $$ \normalsize \text {(in mentric units the constant 12 shoud be repalced with 1,000)} $Important Note: If you use the formula based on cutting speed, you must ensure that the speed is not limited by the machine’s maximum RPM. If that is the case, use the formula based on the spindle speed!Formula in metric unitsFn – Feedrate [mm/rev]Vc – Cutting Speed [m /min]d – Turned Diameter [mm]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{1000 \times F_n \times V_c} $Formula in Imperial unitsFn – Feedrate [IPR]Vc – Cutting Speed [SFM]d – Turned Diameter [Inch]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $

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Lathefeeds and speeds Chart

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Cutting speedcalculator

$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large n= \huge \frac{V_c}{C} $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large n = \huge \frac{1000 \times V_c}{\pi \times d} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $

Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large n = \huge \frac{1000 \times V_c}{\pi \times d} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $

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This page includes only elementary calculators. For more advanced calculators, there is a separate page for each. Go to the Machining Calculators Page for the complete list.Choose a Turning CalculatorCutting SpeedSpindle SpeedMetal RemovalMachining TimeSurface FinishPayment options Cutting Speed Calculator and FormulasHow to calculate the cutting speed in a turning operation based on the workpiece diameter and spindle speedd – Turned Diametern – Spindle SpeedVc – Cutting SpeedToggle mm / InchOther CalculatorsPayment options Payment options TheoryCutting speed is the relative linear velocity between the tip of the turning insert and the workpiece. It is the product of the rotation speed of the workpiece (Spindle speed) and the circumference at the smallest diameter of the cut.Important Note: Pay attention that the diameter d is the smallest diameter in the operation. In external turning, it is smaller than the outer diameter, and in internal turning, and larger than the inner diameter!$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large Vc= n \times C $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large V_c = \huge \frac{n \times \pi \times d}{1000} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large V_c = \huge \frac{n \times \pi \times d}{12} $Spindle Speed Calculator and FormulasHow to calculate the spindle speed of a lathe based on the turned diameter and cutting speedd – Turned Diametern – Spindle Speed.Vc – Cutting SpeedToggle mm / InchOther CalculatorsPayment options Payment options TheoryThe turning inserts catalog or our experience tells us the cutting speed we need to use for a given application. On the other hand, the CNC lathe is limited by its maximum spindle speed. Therefore it is common that we need to compute the spindle speed out of a given cutting speed to ensure that the speed we want to run at is within the machine’s limit. It is calculated by dividing the cutting speed by the turned diameter circumference.Important Note: Pay attention that the diameter d is the smallest diameter in the operation. In external turning, it is smaller than the outer diameter, and in internal turning, it is larger than the inner diameter!$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large n= \huge \frac{V_c}{C} $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large n = \huge \frac{1000 \times V_c}{\pi \times d} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $Metal Removal Rate Calculator and FormulasThe MRR Calculator determines the volume of material removed per minute by a turning operation at certain cutting conditions.Ap -Depth of cutFn – FeedrateVc – Cutting SpeedQ – MRRToggle mm / InchOther CalculatorsPayment options Payment options TheoryThe Metal removal rate (MRR) is measured in cubic inches (Or cubic cm) per minute and indicates how much material is machined in one minute at a set of cutting conditions. In turning, it is the product of the Feedrate, depth of cut, and cutting speed. Learn more in our in-depth Metal Removal Page. MRR is used for two purposes:Comparing the productivity between two sets of cutting conditions.Estimating the required machine power consumption.Formula in metric unitsFn – Feedrate [mm/rev]ap -Depth of cut [mm]Vc – Cutting Speed [m /min]Q – Metal Removal Rate [cm3/min]$ \large Q = V_c \times F_n \times a_p $Formula in Imperial unitsFn – Feedrate [IPR]ap -Depth of cut [inch]Vc – Cutting Speed [SFM]Q – Metal Removal Rate [inch3/min]$ \large Q = V_c \times F_n \times a_p \times 12$Machining Time Calculator and FormulasDetermine how long it takes to turn a given length at certain cutting conditions.Fn – FeedrateVc – Cutting Speedn – Spindle Speedl – LengthToggle mm / InchOther CalculatorsPayment options Payment options TheorySince the feddrate for turning is expressed in distance per one full spindle rotation, the linear speed in the feed direction is the product of the feedrate and the spindle rotation speed:$ \large V_f = n \times F_n $Hence the cutting time is the length divided by the linear speed:$ \large T = \huge \frac{l}{V_f} = \frac{l}{F_n \times n}$However, in most cases, we know the cutting speed, not the spindle speed. If we substitute n with the spindle speed formula, we can calculate the machining time directly:$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $$ \normalsize \text {(in mentric units the constant 12 shoud be repalced with 1,000)} $Important Note: If you use the formula based on cutting speed, you must ensure that the speed is not limited by the machine’s maximum RPM. If that is the case, use the formula based on the spindle speed!Formula in metric unitsFn – Feedrate [mm/rev]Vc – Cutting Speed [m /min]d – Turned Diameter [mm]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{1000 \times F_n \times V_c} $Formula in Imperial unitsFn – Feedrate [IPR]Vc – Cutting Speed [SFM]d – Turned Diameter [Inch]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $Surface Finish Calculator and FormulasDetermine the theoretical surface roughness that can be achieved per a given pair or insert corner radius and feedrate.Power Tip – Below is a simple calculator with basic explanations. For advanced surface finish calculators with detailed explanations, Go HereFn – Feedrater – Corner RadiusRa – Surface FinishToggle mm / InchOther CalculatorsPayment options Payment options TheoryThe surface roughness of the turning operation depends on the feedrate and the insert corner radius. A lower feedrate improves the surface finish, as does a larger corner radius.Power Tip – The feedrate is squared in the formula and therefore has a more significant influence. When you need to improve the surface quality, start by reducing the feedrate$ \large R_a = K \times \huge \frac {F_n^{2}}{r} $$ \normalsize \text {(K is a constant that depends on the units used)} $This formula provides the best theoretical surface finish at optimal conditions. The actual surface quality depends on additional factors such as stability and cutting edge wear.Formula in metric unitsFn – Feed rate [mm/rev]r – Corner Radius[ mm]Ra – Surface Finish [μ]$ \large R_a = 46 \times \huge \frac {F_n^{2}}{r} $Formula in Imperial unitsFn – Feed rate [IPR]r – Corner Radius [Inch]Ra – Surface Finish [μ Inches]$ \large R_a = 31,675 \times \huge \frac {F_n^{2}}{r} $Related Glossary Terms:Cutting SpeedRPMCircumferenceCNC MachineMetal Removal Rate (MRR)Feedrate (Turning)Surface Finish

$ \large V_f = n \times F_n $Hence the cutting time is the length divided by the linear speed:$ \large T = \huge \frac{l}{V_f} = \frac{l}{F_n \times n}$However, in most cases, we know the cutting speed, not the spindle speed. If we substitute n with the spindle speed formula, we can calculate the machining time directly:$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $$ \normalsize \text {(in mentric units the constant 12 shoud be repalced with 1,000)} $Important Note: If you use the formula based on cutting speed, you must ensure that the speed is not limited by the machine’s maximum RPM. If that is the case, use the formula based on the spindle speed!Formula in metric unitsFn – Feedrate [mm/rev]Vc – Cutting Speed [m /min]d – Turned Diameter [mm]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{1000 \times F_n \times V_c} $Formula in Imperial unitsFn – Feedrate [IPR]Vc – Cutting Speed [SFM]d – Turned Diameter [Inch]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $

This page is a collection of basic Turning calculators and formulas. Each topic includes an online calculator, formulas, and explanations. For easier use, you can toggle between the units (Metric/Imperial) and choose to view everything or only the calculators (Explanations and formulas will be hidden)This page includes only elementary calculators. For more advanced calculators, there is a separate page for each. Go to the Machining Calculators Page for the complete list.Choose a Turning CalculatorCutting SpeedSpindle SpeedMetal RemovalMachining TimeSurface FinishPayment options Cutting Speed Calculator and FormulasHow to calculate the cutting speed in a turning operation based on the workpiece diameter and spindle speedd – Turned Diametern – Spindle SpeedVc – Cutting SpeedToggle mm / InchOther CalculatorsPayment options Payment options TheoryCutting speed is the relative linear velocity between the tip of the turning insert and the workpiece. It is the product of the rotation speed of the workpiece (Spindle speed) and the circumference at the smallest diameter of the cut.Important Note: Pay attention that the diameter d is the smallest diameter in the operation. In external turning, it is smaller than the outer diameter, and in internal turning, and larger than the inner diameter!$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large Vc= n \times C $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large V_c = \huge \frac{n \times \pi \times d}{1000} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large V_c = \huge \frac{n \times \pi \times d}{12} $Spindle Speed Calculator and FormulasHow to calculate the spindle speed of a lathe based on the turned diameter and cutting speedd – Turned Diametern – Spindle Speed.Vc – Cutting SpeedToggle mm / InchOther CalculatorsPayment options Payment options TheoryThe turning inserts catalog or our experience tells us the cutting speed we need to use for a given application. On the other hand, the CNC lathe is limited by its maximum spindle speed. Therefore it is common that we need to compute the spindle speed out of a given cutting speed to ensure that the speed we want to run at is within the machine’s limit. It is calculated by dividing the cutting speed by the turned diameter circumference.Important Note: Pay attention that the diameter d is the smallest diameter in the operation. In external turning, it is smaller than the outer diameter, and in internal turning, it is larger than the inner diameter!$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large n= \huge \frac{V_c}{C} $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large n = \huge \frac{1000 \times V_c}{\pi \times d} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $Metal Removal Rate Calculator and FormulasThe MRR Calculator determines the volume of material removed per minute by a turning operation at certain cutting conditions.Ap -Depth of cutFn – FeedrateVc – Cutting SpeedQ – MRRToggle mm / InchOther CalculatorsPayment options Payment options TheoryThe Metal removal rate (MRR) is measured in cubic inches (Or cubic cm) per minute and indicates how much material is machined in one minute at a set of cutting conditions. In turning, it is the product of the Feedrate, depth of cut, and cutting speed. Learn more in our in-depth Metal Removal Page. MRR is used for two purposes:Comparing the productivity between two sets of cutting conditions.Estimating the required machine power consumption.Formula in metric unitsFn – Feedrate [mm/rev]ap -Depth of cut [mm]Vc – Cutting Speed [m /min]Q – Metal Removal Rate [cm3/min]$ \large Q = V_c \times F_n \times a_p $Formula in Imperial unitsFn – Feedrate [IPR]ap -Depth of cut [inch]Vc – Cutting Speed [SFM]Q – Metal Removal Rate [inch3/min]$ \large Q = V_c \times F_n \times a_p \times 12$Machining Time Calculator and FormulasDetermine how long it takes to turn a given length at certain cutting conditions.Fn – FeedrateVc – Cutting Speedn – Spindle Speedl – LengthToggle mm / InchOther CalculatorsPayment options Payment options TheorySince the feddrate for turning is expressed in distance per one full spindle rotation, the linear speed in the feed direction is the product of the feedrate and the spindle rotation speed:$ \large V_f = n \times F_n $Hence the cutting time is the length divided by the linear speed:$ \large T = \huge \frac{l}{V_f} = \frac{l}{F_n \times n}$However, in most cases, we know the cutting speed, not the spindle speed. If we substitute n with the spindle speed formula, we can calculate the machining time directly:$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $$ \normalsize \text {(in mentric units the constant 12 shoud be repalced with 1,000)} $Important Note: If you use the formula based on cutting speed, you must ensure that the speed is not limited by the machine’s maximum RPM. If that is the case, use the formula based on the spindle speed!Formula in metric unitsFn – Feedrate [mm/rev]Vc – Cutting Speed [m /min]d – Turned Diameter [mm]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{1000 \times F_n \times V_c} $Formula in Imperial unitsFn – Feedrate [IPR]Vc – Cutting Speed [SFM]d – Turned Diameter [Inch]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $Surface Finish Calculator and FormulasDetermine the theoretical surface roughness that can be achieved per a given pair or insert corner radius and feedrate.Power Tip – Below is a simple calculator with basic explanations. For advanced surface finish calculators with detailed explanations, Go HereFn – Feedrater – Corner RadiusRa – Surface FinishToggle mm / InchOther CalculatorsPayment options Payment options TheoryThe surface roughness of the turning operation depends on the feedrate and the insert corner radius. A lower feedrate improves the surface finish, as does a larger corner radius.Power Tip – The feedrate is squared in the formula and therefore has a more significant influence. When you need to improve the surface quality, start by reducing the feedrate$ \large R_a = K \times \huge \frac {F_n^{2}}{r} $$ \normalsize \text {(K is a constant that depends on the units used)} $This formula provides the best theoretical surface finish at optimal conditions. The actual surface quality depends on additional factors such as stability and cutting edge wear.Formula in metric unitsFn – Feed rate [mm/rev]r – Corner Radius[ mm]Ra – Surface Finish [μ]$ \large R_a = 46 \times \huge \frac {F_n^{2}}{r} $Formula in Imperial unitsFn – Feed rate [IPR]r – Corner Radius [Inch]Ra – Surface Finish [μ Inches]$ \large R_a = 31,675 \times \huge \frac {F_n^{2}}{r} $Related Glossary Terms:Cutting SpeedRPMCircumferenceCNC MachineMetal Removal Rate (MRR)Feedrate (Turning)Surface Finish

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Since the feddrate for turning is expressed in distance per one full spindle rotation, the linear speed in the feed direction is the product of the feedrate and the spindle rotation speed:$ \large V_f = n \times F_n $Hence the cutting time is the length divided by the linear speed:$ \large T = \huge \frac{l}{V_f} = \frac{l}{F_n \times n}$However, in most cases, we know the cutting speed, not the spindle speed. If we substitute n with the spindle speed formula, we can calculate the machining time directly:$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $$ \normalsize \text {(in mentric units the constant 12 shoud be repalced with 1,000)} $Important Note: If you use the formula based on cutting speed, you must ensure that the speed is not limited by the machine’s maximum RPM. If that is the case, use the formula based on the spindle speed!Formula in metric unitsFn – Feedrate [mm/rev]Vc – Cutting Speed [m /min]d – Turned Diameter [mm]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{1000 \times F_n \times V_c} $Formula in Imperial unitsFn – Feedrate [IPR]Vc – Cutting Speed [SFM]d – Turned Diameter [Inch]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $

TheoryThe turning inserts catalog or our experience tells us the cutting speed we need to use for a given application. On the other hand, the CNC lathe is limited by its maximum spindle speed. Therefore it is common that we need to compute the spindle speed out of a given cutting speed to ensure that the speed we want to run at is within the machine’s limit. It is calculated by dividing the cutting speed by the turned diameter circumference.Important Note: Pay attention that the diameter d is the smallest diameter in the operation. In external turning, it is smaller than the outer diameter, and in internal turning, it is larger than the inner diameter!$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large n= \huge \frac{V_c}{C} $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large n = \huge \frac{1000 \times V_c}{\pi \times d} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $

And despite all of the tools and high-speed camera systems available to test, the one thing Scheffler and Olson used was a simple dry-erase marker. Why? To find out where Scheffler was making contact with the ball on the various face designs. From there, the discussion turned to how each putter felt and sounded.

The MRR Calculator determines the volume of material removed per minute by a turning operation at certain cutting conditions.Ap -Depth of cutFn – FeedrateVc – Cutting SpeedQ – MRRToggle mm / InchOther CalculatorsPayment options Payment options TheoryThe Metal removal rate (MRR) is measured in cubic inches (Or cubic cm) per minute and indicates how much material is machined in one minute at a set of cutting conditions. In turning, it is the product of the Feedrate, depth of cut, and cutting speed. Learn more in our in-depth Metal Removal Page. MRR is used for two purposes:Comparing the productivity between two sets of cutting conditions.Estimating the required machine power consumption.Formula in metric unitsFn – Feedrate [mm/rev]ap -Depth of cut [mm]Vc – Cutting Speed [m /min]Q – Metal Removal Rate [cm3/min]$ \large Q = V_c \times F_n \times a_p $Formula in Imperial unitsFn – Feedrate [IPR]ap -Depth of cut [inch]Vc – Cutting Speed [SFM]Q – Metal Removal Rate [inch3/min]$ \large Q = V_c \times F_n \times a_p \times 12$

It’s no secret that Scottie Scheffler has been struggling with this putting. Whether it’s changing up his style of putter or hiring putting coach Phil Kenyon to help, it continues to be a work in progress.

Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large V_c = \huge \frac{n \times \pi \times d}{1000} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large V_c = \huge \frac{n \times \pi \times d}{12} $

Determine how long it takes to turn a given length at certain cutting conditions.Fn – FeedrateVc – Cutting Speedn – Spindle Speedl – LengthToggle mm / InchOther CalculatorsPayment options Payment options TheorySince the feddrate for turning is expressed in distance per one full spindle rotation, the linear speed in the feed direction is the product of the feedrate and the spindle rotation speed:$ \large V_f = n \times F_n $Hence the cutting time is the length divided by the linear speed:$ \large T = \huge \frac{l}{V_f} = \frac{l}{F_n \times n}$However, in most cases, we know the cutting speed, not the spindle speed. If we substitute n with the spindle speed formula, we can calculate the machining time directly:$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $$ \normalsize \text {(in mentric units the constant 12 shoud be repalced with 1,000)} $Important Note: If you use the formula based on cutting speed, you must ensure that the speed is not limited by the machine’s maximum RPM. If that is the case, use the formula based on the spindle speed!Formula in metric unitsFn – Feedrate [mm/rev]Vc – Cutting Speed [m /min]d – Turned Diameter [mm]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{1000 \times F_n \times V_c} $Formula in Imperial unitsFn – Feedrate [IPR]Vc – Cutting Speed [SFM]d – Turned Diameter [Inch]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $

$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large Vc= n \times C $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large V_c = \huge \frac{n \times \pi \times d}{1000} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large V_c = \huge \frac{n \times \pi \times d}{12} $

Cutting speed is the relative linear velocity between the tip of the turning insert and the workpiece. It is the product of the rotation speed of the workpiece (Spindle speed) and the circumference at the smallest diameter of the cut.Important Note: Pay attention that the diameter d is the smallest diameter in the operation. In external turning, it is smaller than the outer diameter, and in internal turning, and larger than the inner diameter!$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large Vc= n \times C $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large V_c = \huge \frac{n \times \pi \times d}{1000} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large V_c = \huge \frac{n \times \pi \times d}{12} $

Lathe feed rate calculatorapp

The Metal removal rate (MRR) is measured in cubic inches (Or cubic cm) per minute and indicates how much material is machined in one minute at a set of cutting conditions. In turning, it is the product of the Feedrate, depth of cut, and cutting speed. Learn more in our in-depth Metal Removal Page. MRR is used for two purposes:Comparing the productivity between two sets of cutting conditions.Estimating the required machine power consumption.Formula in metric unitsFn – Feedrate [mm/rev]ap -Depth of cut [mm]Vc – Cutting Speed [m /min]Q – Metal Removal Rate [cm3/min]$ \large Q = V_c \times F_n \times a_p $Formula in Imperial unitsFn – Feedrate [IPR]ap -Depth of cut [inch]Vc – Cutting Speed [SFM]Q – Metal Removal Rate [inch3/min]$ \large Q = V_c \times F_n \times a_p \times 12$

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Power Tip – Below is a simple calculator with basic explanations. For advanced surface finish calculators with detailed explanations, Go HereFn – Feedrater – Corner RadiusRa – Surface FinishToggle mm / InchOther CalculatorsPayment options Payment options TheoryThe surface roughness of the turning operation depends on the feedrate and the insert corner radius. A lower feedrate improves the surface finish, as does a larger corner radius.Power Tip – The feedrate is squared in the formula and therefore has a more significant influence. When you need to improve the surface quality, start by reducing the feedrate$ \large R_a = K \times \huge \frac {F_n^{2}}{r} $$ \normalsize \text {(K is a constant that depends on the units used)} $This formula provides the best theoretical surface finish at optimal conditions. The actual surface quality depends on additional factors such as stability and cutting edge wear.Formula in metric unitsFn – Feed rate [mm/rev]r – Corner Radius[ mm]Ra – Surface Finish [μ]$ \large R_a = 46 \times \huge \frac {F_n^{2}}{r} $Formula in Imperial unitsFn – Feed rate [IPR]r – Corner Radius [Inch]Ra – Surface Finish [μ Inches]$ \large R_a = 31,675 \times \huge \frac {F_n^{2}}{r} $

$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large Vc= n \times C $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large V_c = \huge \frac{n \times \pi \times d}{1000} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large V_c = \huge \frac{n \times \pi \times d}{12} $

CNCfeed rate calculator

Power Tip – The feedrate is squared in the formula and therefore has a more significant influence. When you need to improve the surface quality, start by reducing the feedrate$ \large R_a = K \times \huge \frac {F_n^{2}}{r} $$ \normalsize \text {(K is a constant that depends on the units used)} $This formula provides the best theoretical surface finish at optimal conditions. The actual surface quality depends on additional factors such as stability and cutting edge wear.Formula in metric unitsFn – Feed rate [mm/rev]r – Corner Radius[ mm]Ra – Surface Finish [μ]$ \large R_a = 46 \times \huge \frac {F_n^{2}}{r} $Formula in Imperial unitsFn – Feed rate [IPR]r – Corner Radius [Inch]Ra – Surface Finish [μ Inches]$ \large R_a = 31,675 \times \huge \frac {F_n^{2}}{r} $

This formula provides the best theoretical surface finish at optimal conditions. The actual surface quality depends on additional factors such as stability and cutting edge wear.Formula in metric unitsFn – Feed rate [mm/rev]r – Corner Radius[ mm]Ra – Surface Finish [μ]$ \large R_a = 46 \times \huge \frac {F_n^{2}}{r} $Formula in Imperial unitsFn – Feed rate [IPR]r – Corner Radius [Inch]Ra – Surface Finish [μ Inches]$ \large R_a = 31,675 \times \huge \frac {F_n^{2}}{r} $

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Important Note: Pay attention that the diameter d is the smallest diameter in the operation. In external turning, it is smaller than the outer diameter, and in internal turning, and larger than the inner diameter!$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large Vc= n \times C $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large V_c = \huge \frac{n \times \pi \times d}{1000} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large V_c = \huge \frac{n \times \pi \times d}{12} $

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Mar 8, 2024 — I would like to get ideas on chamfer transitions over rounded corners. The chamfer angles on adjacent edges are different.

Even last week at Pebble Beach we spotted Scheffler working with his team — including putter maker Logan Olson of Olson Manufacturing — and testing several prototype putters before the start of the tournament.

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The surface roughness of the turning operation depends on the feedrate and the insert corner radius. A lower feedrate improves the surface finish, as does a larger corner radius.Power Tip – The feedrate is squared in the formula and therefore has a more significant influence. When you need to improve the surface quality, start by reducing the feedrate$ \large R_a = K \times \huge \frac {F_n^{2}}{r} $$ \normalsize \text {(K is a constant that depends on the units used)} $This formula provides the best theoretical surface finish at optimal conditions. The actual surface quality depends on additional factors such as stability and cutting edge wear.Formula in metric unitsFn – Feed rate [mm/rev]r – Corner Radius[ mm]Ra – Surface Finish [μ]$ \large R_a = 46 \times \huge \frac {F_n^{2}}{r} $Formula in Imperial unitsFn – Feed rate [IPR]r – Corner Radius [Inch]Ra – Surface Finish [μ Inches]$ \large R_a = 31,675 \times \huge \frac {F_n^{2}}{r} $

How to calculate the spindle speed of a lathe based on the turned diameter and cutting speedd – Turned Diametern – Spindle Speed.Vc – Cutting SpeedToggle mm / InchOther CalculatorsPayment options Payment options TheoryThe turning inserts catalog or our experience tells us the cutting speed we need to use for a given application. On the other hand, the CNC lathe is limited by its maximum spindle speed. Therefore it is common that we need to compute the spindle speed out of a given cutting speed to ensure that the speed we want to run at is within the machine’s limit. It is calculated by dividing the cutting speed by the turned diameter circumference.Important Note: Pay attention that the diameter d is the smallest diameter in the operation. In external turning, it is smaller than the outer diameter, and in internal turning, it is larger than the inner diameter!$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large n= \huge \frac{V_c}{C} $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large n = \huge \frac{1000 \times V_c}{\pi \times d} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $

Formula in metric unitsFn – Feedrate [mm/rev]ap -Depth of cut [mm]Vc – Cutting Speed [m /min]Q – Metal Removal Rate [cm3/min]$ \large Q = V_c \times F_n \times a_p $Formula in Imperial unitsFn – Feedrate [IPR]ap -Depth of cut [inch]Vc – Cutting Speed [SFM]Q – Metal Removal Rate [inch3/min]$ \large Q = V_c \times F_n \times a_p \times 12$

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LatheRPMcalculatormetric

TheorySince the feddrate for turning is expressed in distance per one full spindle rotation, the linear speed in the feed direction is the product of the feedrate and the spindle rotation speed:$ \large V_f = n \times F_n $Hence the cutting time is the length divided by the linear speed:$ \large T = \huge \frac{l}{V_f} = \frac{l}{F_n \times n}$However, in most cases, we know the cutting speed, not the spindle speed. If we substitute n with the spindle speed formula, we can calculate the machining time directly:$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $$ \normalsize \text {(in mentric units the constant 12 shoud be repalced with 1,000)} $Important Note: If you use the formula based on cutting speed, you must ensure that the speed is not limited by the machine’s maximum RPM. If that is the case, use the formula based on the spindle speed!Formula in metric unitsFn – Feedrate [mm/rev]Vc – Cutting Speed [m /min]d – Turned Diameter [mm]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{1000 \times F_n \times V_c} $Formula in Imperial unitsFn – Feedrate [IPR]Vc – Cutting Speed [SFM]d – Turned Diameter [Inch]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $

How to calculate the cutting speed in a turning operation based on the workpiece diameter and spindle speedd – Turned Diametern – Spindle SpeedVc – Cutting SpeedToggle mm / InchOther CalculatorsPayment options Payment options TheoryCutting speed is the relative linear velocity between the tip of the turning insert and the workpiece. It is the product of the rotation speed of the workpiece (Spindle speed) and the circumference at the smallest diameter of the cut.Important Note: Pay attention that the diameter d is the smallest diameter in the operation. In external turning, it is smaller than the outer diameter, and in internal turning, and larger than the inner diameter!$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large Vc= n \times C $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large V_c = \huge \frac{n \times \pi \times d}{1000} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large V_c = \huge \frac{n \times \pi \times d}{12} $

Scottie Scheffler was spotted on the practice green at Pebble Beach working with Logan Olson and using this tool to fine-tune his putter.

Ryan Barath is GOLF Magazine and GOLF.com’s senior editor for equipment. He has an extensive club-fitting and -building background with more than 20 years of experience working with golfers of all skill levels, including PGA Tour players. Before joining the staff, he was the lead content strategist for Tour Experience Golf, in Toronto, Canada.

Important Note: If you use the formula based on cutting speed, you must ensure that the speed is not limited by the machine’s maximum RPM. If that is the case, use the formula based on the spindle speed!Formula in metric unitsFn – Feedrate [mm/rev]Vc – Cutting Speed [m /min]d – Turned Diameter [mm]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{1000 \times F_n \times V_c} $Formula in Imperial unitsFn – Feedrate [IPR]Vc – Cutting Speed [SFM]d – Turned Diameter [Inch]T – Turning Machining Time [min]$ \large T = \huge \frac{l \times \pi \times d}{12 \times F_n \times V_c} $

Although it has not been officially confirmed by either party, current events — along with the fact that the privacy policy on Olson’s website says it’s property of TaylorMade Golf — suggest Olson has partnered with TaylorMade in some fashion to help Scheffler and other TaylorMade staffers with their flatsticks.

Important Note: Pay attention that the diameter d is the smallest diameter in the operation. In external turning, it is smaller than the outer diameter, and in internal turning, it is larger than the inner diameter!$ \large d=OD{ }-{ }2 \times{ }a_p \text{ (External turning)} $$ \large d=ID{ }+{ }2 \times{ }a_p \text{ (Internal turning)} $$ \large \text{Circumference = }C = 2 \times \pi \times r = \pi \times d $$ \large n= \huge \frac{V_c}{C} $Power Tip – Use our Speed and Feed Calculator to get the recommended cutting speed based on dozens of parameters!Formula in metric unitsd – [mm]n – [rpm] (Revolutions per minute)Vc – [m/min]$ \large n = \huge \frac{1000 \times V_c}{\pi \times d} $Formula in Imperial unitsd – [Inch]n – [rpm] (Revolutions per minute)Vc – [SFM] (Surface feet per minute)$ \large n = \huge \frac{12 \times V_c}{\pi \times d} $