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

Surface feet per minute Calculator

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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

SFM for bronze

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Speeds and Feedschart

Surface Feet per minuteChart

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Our milling services can be used for a wide variety of complex machined parts, such as hydraulic components, fasteners, shafts, and fittings – along with a broad range of alternative products. Our CNC high speed vertical milling operations have met the needs of diverse industries, allowing us to process up to 3,000 units per order. Contact Mallory Industries, Inc today to learn more!

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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.

SFMchartfor milling

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

Our ISO certified machine shop is well-equipped with seven 4-axis machining centers. In addition, we possess 3 high speed vertical milling machines with 83 X 47 X 35 inch work envelopes and full rotary tables that can handle parts measuring up to 20 inches in diameter. Our high speed vertical milling machines work with a wide variety of materials – including exotic and precious metals – while meeting extremely tight (±) 0.0002 of an inch precision tolerances on all part dimensions.