The cutting tools catalogs or our experience tells us the SFM (Cutting Speed) we need to use for a given application. On the other hand, the CNC machine is programmed with the RPM (Spindle speed). Therefore it is common that we need to compute the RPM from a given SFM either for programming or to ensure that the SFM we want to run at is within the machine’s limit. It is calculated by dividing the cutting speed by the cutter’s circumference.

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Well i hope you would have got some insights about what Cutting Speed is and how about calculating the cutting speed for and efficient machining process. Kindly let us know your comments in the comment box below. Also if you have any questions feel free to write to us.

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SFMto RPMCalculator

In a turning operation during metal removal, for each rotation of the spindle the material along the circumference is removed. This can be denoted as πD.

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The cutting tools catalogs or our experience tells us the SFM (Cutting Speed) we need to use for a given application. On the other hand, the CNC machine is programmed with the RPM (Spindle speed). Therefore it is common that we need to compute the RPM from a given SFM either for programming or to ensure that the SFM we want to run at is within the machine’s limit. It is calculated by dividing the cutting speed by the cutter’s circumference.* Learn more about the fundamentals behind this equationSFM to RPM Chart (Inch)Find the required RPM according to your tool’s diameter and SFMSFM1/16"1/8"3/16"1/4"3/8"1/2"5/8"3/4"7/8"1"1-1/2"2"106103052051551007560504540252015915460305230155115907565554030201,22061040530520515512010085755040251,530765510380255190155125110956550301,8359156104603052301851551301157555352,1401,0707155353552652151801551359065402,4451,22081561040530524520517515510075452,7501,37591569046034527523019517011585503,0551,5301,02076551038030525522019012595603,6651,8351,220915610460365305260230155115704,2802,1401,4251,070715535430355305265180135804,8902,4451,6301,220815610490405350305205155905,5002,7501,8351,3759156905504603953452301701006,1103,0552,0351,5301,0207656105104353802551901106,7253,3602,2401,6801,1208406705604804202802101207,3353,6652,4451,8351,2209157356105254603052301307,9453,9752,6501,9851,3259957956605704953302501408,5554,2802,8502,1401,4251,0708557156105353552651509,1704,5853,0552,2901,5301,14591576565557538028517510,6955,3503,5652,6751,7851,3351,07089076567044533520012,2256,1104,0753,0552,0351,5301,2201,02087576551038022513,7506,8754,5853,4402,2901,7201,3751,14598086057543025015,2807,6405,0953,8202,5451,9101,5301,2751,09095563548027516,8108,4055,6054,2002,8002,1001,6801,4001,2001,05070052530018,3359,1706,1104,5853,0552,2901,8351,5301,3101,14576557535021,39010,6957,1305,3503,5652,6752,1401,7851,5301,33589067040024,45012,2258,1506,1104,0753,0552,4452,0351,7451,5301,02076545027,50513,7509,1706,8754,5853,4402,7502,2901,9651,7201,14586050030,56015,28010,1857,6405,0953,8203,0552,5452,1851,9101,27595555033,61516,81011,2058,4055,6054,2003,3602,8002,4002,1001,4001,05060036,67018,33512,2259,1706,1104,5853,6653,0552,6202,2901,5301,14570042,78521,39014,26010,6957,1305,3504,2803,5653,0552,6751,7851,33580048,89524,45016,30012,2258,1506,1104,8904,0753,4953,0552,0351,53090055,01027,50518,33513,7509,1706,8755,5004,5853,9303,4402,2901,7201,00061,12030,56020,37515,28010,1857,6406,1105,0954,3653,8202,5451,9101,25076,40038,20025,46519,10012,7359,5507,6406,3655,4554,7753,1852,3901,50091,68045,84030,56022,92015,28011,4609,1707,6406,5505,7303,8202,8651,750106,96053,48035,65526,74017,82513,37010,6958,9157,6406,6854,4553,3452,000122,24061,12040,74530,56020,37515,28012,22510,1858,7307,6405,0953,820SFM to RPM Chart (Metric)Find the required RPM according to your tool’s diameter and SFMSFM2 mm3 mm4 mm6 mm8 mm10 mm12 mm16 mm20 mm25 mm40 mm50 mm10485325245160120958060504025201573048536524518014512090756035302097064548532524519516012095805040251,215810605405305245200150120956050301,4559707304853652902451801451157560351,7001,1308505654253402852101701358570401,9401,2959706454853903252451951559580452,1851,4551,09073054543536527522017511085502,4251,6151,21581060548540530524519512095602,9101,9401,455970730580485365290235145115703,3952,2651,7001,130850680565425340270170135803,8802,5851,9401,295970775645485390310195155904,3652,9102,1851,4551,0908757305454353502201751004,8503,2352,4251,6151,2159708106054853902451951105,3353,5602,6701,7801,3351,0658906655354252652151205,8203,8802,9101,9401,4551,1659707305804652902351306,3054,2053,1552,1001,5751,2601,0507906305053152501406,7904,5303,3952,2651,7001,3601,1308506805453402701507,2754,8503,6402,4251,8201,4551,2159107305803652901758,4905,6604,2452,8302,1201,7001,4151,0608506804253402009,7056,4704,8503,2352,4251,9401,6151,21597077548539022510,9157,2755,4603,6402,7302,1851,8201,3651,09087554543525012,1308,0856,0654,0453,0302,4252,0201,5151,21597060548527513,3408,8956,6704,4453,3352,6702,2251,6701,3351,06566553530014,5559,7057,2754,8503,6402,9102,4251,8201,4551,16573058035016,98011,3208,4905,6604,2453,3952,8302,1201,7001,36085068040019,40512,9359,7056,4704,8503,8803,2352,4251,9401,55097077545021,83014,55510,9157,2755,4604,3653,6402,7302,1851,7451,09087550024,25516,17012,1308,0856,0654,8504,0453,0302,4251,9401,21597055026,68517,79013,3408,8956,6705,3354,4453,3352,6702,1351,3351,06560029,11019,40514,5559,7057,2755,8204,8503,6402,9102,3301,4551,16570033,96022,64016,98011,3208,4906,7905,6604,2453,3952,7151,7001,36080038,81025,87519,40512,9359,7057,7606,4704,8503,8803,1051,9401,55090043,66529,11021,83014,55510,9158,7357,2755,4604,3653,4952,1851,7451,00048,51532,34524,25516,17012,1309,7058,0856,0654,8503,8802,4251,9401,25060,64540,43030,32020,21515,16012,13010,1057,5806,0654,8503,0302,4251,50072,77048,51536,38524,25518,19514,55512,1309,0957,2755,8203,6402,9101,75084,90056,60042,45028,30021,22516,98014,15010,6108,4906,7904,2453,3952,00097,03064,68548,51532,34524,25519,40516,17012,1309,7057,7604,8503,880Related Glossary Terms:Cutting SpeedCNC MachineRPMCircumference

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SFM calculatorDrilling

Jul 23, 2021 — End Mill. This type of cutter, like the face milling cutter, has teeth on the periphery and at the end. End mills are used for a large variety ...

2024103 — It is often necessary to convert RPM into linear speed, such as feet per minute (FPM), to understand the actual movement speed of a rotating ...

Find the required RPM according to your tool’s diameter and SFMSFM1/16"1/8"3/16"1/4"3/8"1/2"5/8"3/4"7/8"1"1-1/2"2"106103052051551007560504540252015915460305230155115907565554030201,22061040530520515512010085755040251,530765510380255190155125110956550301,8359156104603052301851551301157555352,1401,0707155353552652151801551359065402,4451,22081561040530524520517515510075452,7501,37591569046034527523019517011585503,0551,5301,02076551038030525522019012595603,6651,8351,220915610460365305260230155115704,2802,1401,4251,070715535430355305265180135804,8902,4451,6301,220815610490405350305205155905,5002,7501,8351,3759156905504603953452301701006,1103,0552,0351,5301,0207656105104353802551901106,7253,3602,2401,6801,1208406705604804202802101207,3353,6652,4451,8351,2209157356105254603052301307,9453,9752,6501,9851,3259957956605704953302501408,5554,2802,8502,1401,4251,0708557156105353552651509,1704,5853,0552,2901,5301,14591576565557538028517510,6955,3503,5652,6751,7851,3351,07089076567044533520012,2256,1104,0753,0552,0351,5301,2201,02087576551038022513,7506,8754,5853,4402,2901,7201,3751,14598086057543025015,2807,6405,0953,8202,5451,9101,5301,2751,09095563548027516,8108,4055,6054,2002,8002,1001,6801,4001,2001,05070052530018,3359,1706,1104,5853,0552,2901,8351,5301,3101,14576557535021,39010,6957,1305,3503,5652,6752,1401,7851,5301,33589067040024,45012,2258,1506,1104,0753,0552,4452,0351,7451,5301,02076545027,50513,7509,1706,8754,5853,4402,7502,2901,9651,7201,14586050030,56015,28010,1857,6405,0953,8203,0552,5452,1851,9101,27595555033,61516,81011,2058,4055,6054,2003,3602,8002,4002,1001,4001,05060036,67018,33512,2259,1706,1104,5853,6653,0552,6202,2901,5301,14570042,78521,39014,26010,6957,1305,3504,2803,5653,0552,6751,7851,33580048,89524,45016,30012,2258,1506,1104,8904,0753,4953,0552,0351,53090055,01027,50518,33513,7509,1706,8755,5004,5853,9303,4402,2901,7201,00061,12030,56020,37515,28010,1857,6406,1105,0954,3653,8202,5451,9101,25076,40038,20025,46519,10012,7359,5507,6406,3655,4554,7753,1852,3901,50091,68045,84030,56022,92015,28011,4609,1707,6406,5505,7303,8202,8651,750106,96053,48035,65526,74017,82513,37010,6958,9157,6406,6854,4553,3452,000122,24061,12040,74530,56020,37515,28012,22510,1858,7307,6405,0953,820SFM to RPM Chart (Metric)Find the required RPM according to your tool’s diameter and SFMSFM2 mm3 mm4 mm6 mm8 mm10 mm12 mm16 mm20 mm25 mm40 mm50 mm10485325245160120958060504025201573048536524518014512090756035302097064548532524519516012095805040251,215810605405305245200150120956050301,4559707304853652902451801451157560351,7001,1308505654253402852101701358570401,9401,2959706454853903252451951559580452,1851,4551,09073054543536527522017511085502,4251,6151,21581060548540530524519512095602,9101,9401,455970730580485365290235145115703,3952,2651,7001,130850680565425340270170135803,8802,5851,9401,295970775645485390310195155904,3652,9102,1851,4551,0908757305454353502201751004,8503,2352,4251,6151,2159708106054853902451951105,3353,5602,6701,7801,3351,0658906655354252652151205,8203,8802,9101,9401,4551,1659707305804652902351306,3054,2053,1552,1001,5751,2601,0507906305053152501406,7904,5303,3952,2651,7001,3601,1308506805453402701507,2754,8503,6402,4251,8201,4551,2159107305803652901758,4905,6604,2452,8302,1201,7001,4151,0608506804253402009,7056,4704,8503,2352,4251,9401,6151,21597077548539022510,9157,2755,4603,6402,7302,1851,8201,3651,09087554543525012,1308,0856,0654,0453,0302,4252,0201,5151,21597060548527513,3408,8956,6704,4453,3352,6702,2251,6701,3351,06566553530014,5559,7057,2754,8503,6402,9102,4251,8201,4551,16573058035016,98011,3208,4905,6604,2453,3952,8302,1201,7001,36085068040019,40512,9359,7056,4704,8503,8803,2352,4251,9401,55097077545021,83014,55510,9157,2755,4604,3653,6402,7302,1851,7451,09087550024,25516,17012,1308,0856,0654,8504,0453,0302,4251,9401,21597055026,68517,79013,3408,8956,6705,3354,4453,3352,6702,1351,3351,06560029,11019,40514,5559,7057,2755,8204,8503,6402,9102,3301,4551,16570033,96022,64016,98011,3208,4906,7905,6604,2453,3952,7151,7001,36080038,81025,87519,40512,9359,7057,7606,4704,8503,8803,1051,9401,55090043,66529,11021,83014,55510,9158,7357,2755,4604,3653,4952,1851,7451,00048,51532,34524,25516,17012,1309,7058,0856,0654,8503,8802,4251,9401,25060,64540,43030,32020,21515,16012,13010,1057,5806,0654,8503,0302,4251,50072,77048,51536,38524,25518,19514,55512,1309,0957,2755,8203,6402,9101,75084,90056,60042,45028,30021,22516,98014,15010,6108,4906,7904,2453,3952,00097,03064,68548,51532,34524,25519,40516,17012,1309,7057,7604,8503,880Related Glossary Terms:Cutting SpeedCNC MachineRPMCircumference

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Millingspeed and feedCalculatorfree download

Sfm calculator millingrpm

Long and continuous chips tend to have a negative effect on machining efficiency, with a risk of damage to the cutting tool, workpiece and machine tool.

Feed ratecalculator

Cutting speed is defined as the rate at which the material is removed from the workpiece during machining. In simple terms cutting speed is the metal removal rate. The unit of cutting speed is meters per minute (m/min).

Cutting speed = πD for one complete rotation. Similarly for two rotations it is going to be 2πD and so on. Therefore for “n” number of rotations Cutting Speed can be denoted as πDN. Where π is a constant, D stands for Diameter of the part / Tool, N stands for number of revolutions in rpm.

Find the required RPM according to your tool’s diameter and SFMSFM2 mm3 mm4 mm6 mm8 mm10 mm12 mm16 mm20 mm25 mm40 mm50 mm10485325245160120958060504025201573048536524518014512090756035302097064548532524519516012095805040251,215810605405305245200150120956050301,4559707304853652902451801451157560351,7001,1308505654253402852101701358570401,9401,2959706454853903252451951559580452,1851,4551,09073054543536527522017511085502,4251,6151,21581060548540530524519512095602,9101,9401,455970730580485365290235145115703,3952,2651,7001,130850680565425340270170135803,8802,5851,9401,295970775645485390310195155904,3652,9102,1851,4551,0908757305454353502201751004,8503,2352,4251,6151,2159708106054853902451951105,3353,5602,6701,7801,3351,0658906655354252652151205,8203,8802,9101,9401,4551,1659707305804652902351306,3054,2053,1552,1001,5751,2601,0507906305053152501406,7904,5303,3952,2651,7001,3601,1308506805453402701507,2754,8503,6402,4251,8201,4551,2159107305803652901758,4905,6604,2452,8302,1201,7001,4151,0608506804253402009,7056,4704,8503,2352,4251,9401,6151,21597077548539022510,9157,2755,4603,6402,7302,1851,8201,3651,09087554543525012,1308,0856,0654,0453,0302,4252,0201,5151,21597060548527513,3408,8956,6704,4453,3352,6702,2251,6701,3351,06566553530014,5559,7057,2754,8503,6402,9102,4251,8201,4551,16573058035016,98011,3208,4905,6604,2453,3952,8302,1201,7001,36085068040019,40512,9359,7056,4704,8503,8803,2352,4251,9401,55097077545021,83014,55510,9157,2755,4604,3653,6402,7302,1851,7451,09087550024,25516,17012,1308,0856,0654,8504,0453,0302,4251,9401,21597055026,68517,79013,3408,8956,6705,3354,4453,3352,6702,1351,3351,06560029,11019,40514,5559,7057,2755,8204,8503,6402,9102,3301,4551,16570033,96022,64016,98011,3208,4906,7905,6604,2453,3952,7151,7001,36080038,81025,87519,40512,9359,7057,7606,4704,8503,8803,1051,9401,55090043,66529,11021,83014,55510,9158,7357,2755,4604,3653,4952,1851,7451,00048,51532,34524,25516,17012,1309,7058,0856,0654,8503,8802,4251,9401,25060,64540,43030,32020,21515,16012,13010,1057,5806,0654,8503,0302,4251,50072,77048,51536,38524,25518,19514,55512,1309,0957,2755,8203,6402,9101,75084,90056,60042,45028,30021,22516,98014,15010,6108,4906,7904,2453,3952,00097,03064,68548,51532,34524,25519,40516,17012,1309,7057,7604,8503,880Related Glossary Terms:Cutting SpeedCNC MachineRPMCircumference

Sfm calculator millingsteel

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As indicated above the unit for cutting speed is meters per minute(m/min). Therefore in case if the  diameter of the part or tool is measured in mm the formula for the cutting speed will be as below

Find the rpm to turn a cylinder of 20 mm diameter with a cutting speed of 120 m/min. Diameter of job (d) = 20 mm Cutting speed (CS) = 120 m/min

Drilling, milling, and turning are just some of the CNC techniques that this material is compatible with. Both the CNMG 190612 insert and the CNC tool lathe ...

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