Find out the SFM according to your tool’s diameter and the machines RPMRPM2 mm3 mm4 mm5 mm6 mm8 mm10 mm12 mm16 mm20 mm25 mm1002345681012162126200468101216212533415230069121519253137496277400812162125334149668210350010152126314152628210312960012192531374962749912415570014222936435872871151441808001625334149668299132165206900192837465674931111481862321,0002131415262821031241652062581,1002334455768911131361812272831,2002537496274991241481982473091,30027405467801071341612142683351,40029435872871151441732312893611,50031466277931241551862473093872,0004162821031241652062473304125152,50052771031291552062583094125156443,00062931241551862473093714956187733,500721081441802162893614335777219024,000821241652062473304124956608251,0314,500931391862322783714645577429281,1605,0001031552062583094125156188251,0311,2885,5001131702272833404545676809071,1341,4176,0001241862473093714956187429891,2371,5466,5001342012683354025366708041,0721,3401,6757,0001442162893614335777218661,1541,4431,8047,5001552323093874646187739281,2371,5461,9338,0001652473304124956608259891,3191,6492,0618,5001752633504385267018761,0511,4021,7522,1909,0001862783714645577429281,1131,4841,8552,3199,5001962943924905887839791,1751,5671,9582,44810,0002063094125156188251,0311,2371,6492,0612,57711,0002273404545676809071,1341,3611,8142,2682,83412,0002473714956187429891,2371,4841,9792,4743,09213,0002684025366708041,0721,3401,6082,1442,6803,35014,0002894335777218661,1541,4431,7322,3092,8863,60715,0003094646187739281,2371,5461,8552,4743,0923,865Related Glossary Terms:CNC MachineRPMCutting SpeedCircumference

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CNC machines are programmed by the spindle speed (RPM), but cutting data is typically given in SFM. Therefore it is common that we need to compute the SFM from a given RPM to determine the cutting speed at which our cutting tool is working. It is calculated by dividing the cutter’s circumference by the cutting speed.

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We have more than 70 types inserts, both Negative and Positive Types to choose from, including the most popular ISO stander turning insert.

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Extra care is needed with handling these drills as they are very delicate, especially sizes from 0.1mm - 0.4mm. Make sure everything is running true without any lateral movement.

Buttress (45° / 7°) 52° Internal Threading Inserts.

Most horologists find the easiest way to use these micro drill bits is by first finding the centre with a graver and then holding a micro drill in a pin-vice and then taking them to the work. Use very light pressure whilst taking the drill in and out periodically. No lubrication is necessary, although a small dab of oil can help.

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CNC machines are programmed by the spindle speed (RPM), but cutting data is typically given in SFM. Therefore it is common that we need to compute the SFM from a given RPM to determine the cutting speed at which our cutting tool is working. It is calculated by dividing the cutter’s circumference by the cutting speed.RPM to RPM Chart (Inch)Find out the SFM according to your tool’s diameter and the machine’s RPMRPM1/16"1/8"3/16"1/4"3/8"1/2"5/8"3/4"7/8"1"1-1/2"2"100235710131620232639522003710132026333946527910530051015202939495969791181574007132026395265799210515720950081625334965829811513119626260010202939597998118137157236314700112334466992115137160183275367800132639527910513115718320931441990015294459881181471772062363534711,00016334965981311641962292623935241,100183654721081441802162522884325761,200203959791181571962362753144716281,300214364851281702132552983405116811,400234669921371832292753213675507331,500254974981471962452953443935897852,0003365981311962623273934585247851,0472,50041821231642453274094915736549821,3093,00049981471962953934915896877851,1781,5713,500571151722293444585736878029161,3741,8334,000651311962623935246547859161,0471,5712,0944,500741472212954425897368841,0311,1781,7672,3565,000821642453274916548189821,1451,3091,9632,6185,500901802703605407209001,0801,2601,4402,1602,8806,000981962953935897859821,1781,3741,5712,3563,1426,5001062133194256388511,0641,2761,4891,7022,5533,4037,0001152293444586879161,1451,3741,6041,8332,7493,6657,5001232453684917369821,2271,4731,7181,9632,9453,9278,0001312623935247851,0471,3091,5711,8332,0943,1424,1898,5001392784175568341,1131,3911,6691,9472,2253,3384,4519,0001472954425898841,1781,4731,7672,0622,3563,5344,7129,5001553114666229331,2441,5541,8652,1762,4873,7314,97410,0001643274916549821,3091,6361,9632,2912,6183,9275,23611,0001803605407201,0801,4401,8002,1602,5202,8804,3205,76012,0001963935897851,1781,5711,9632,3562,7493,1424,7126,28313,0002134256388511,2761,7022,1272,5532,9783,4035,1056,80714,0002294586879161,3741,8332,2912,7493,2073,6655,4987,33015,0002454917369821,4731,9632,4542,9453,4363,9275,8907,854RPM to SFM Chart (Metric)Find out the SFM according to your tool’s diameter and the machines RPMRPM2 mm3 mm4 mm5 mm6 mm8 mm10 mm12 mm16 mm20 mm25 mm1002345681012162126200468101216212533415230069121519253137496277400812162125334149668210350010152126314152628210312960012192531374962749912415570014222936435872871151441808001625334149668299132165206900192837465674931111481862321,0002131415262821031241652062581,1002334455768911131361812272831,2002537496274991241481982473091,30027405467801071341612142683351,40029435872871151441732312893611,50031466277931241551862473093872,0004162821031241652062473304125152,50052771031291552062583094125156443,00062931241551862473093714956187733,500721081441802162893614335777219024,000821241652062473304124956608251,0314,500931391862322783714645577429281,1605,0001031552062583094125156188251,0311,2885,5001131702272833404545676809071,1341,4176,0001241862473093714956187429891,2371,5466,5001342012683354025366708041,0721,3401,6757,0001442162893614335777218661,1541,4431,8047,5001552323093874646187739281,2371,5461,9338,0001652473304124956608259891,3191,6492,0618,5001752633504385267018761,0511,4021,7522,1909,0001862783714645577429281,1131,4841,8552,3199,5001962943924905887839791,1751,5671,9582,44810,0002063094125156188251,0311,2371,6492,0612,57711,0002273404545676809071,1341,3611,8142,2682,83412,0002473714956187429891,2371,4841,9792,4743,09213,0002684025366708041,0721,3401,6082,1442,6803,35014,0002894335777218661,1541,4431,7322,3092,8863,60715,0003094646187739281,2371,5461,8552,4743,0923,865Related Glossary Terms:CNC MachineRPMCutting SpeedCircumference

A solid carbide twist drill is perfect for delicate drilling through hard materials for model engineering, archaeology and scientific laboratory work.

These hard, solid tungsten carbide micro twist drill bits, versatile in their application,  are excellent for producing smooth, precision holes and drilling through all hard metals. Ensure a steady hand when using these micro drill bits, ideally used at high speed in a pillar drill.

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Find out the SFM according to your tool’s diameter and the machine’s RPMRPM1/16"1/8"3/16"1/4"3/8"1/2"5/8"3/4"7/8"1"1-1/2"2"100235710131620232639522003710132026333946527910530051015202939495969791181574007132026395265799210515720950081625334965829811513119626260010202939597998118137157236314700112334466992115137160183275367800132639527910513115718320931441990015294459881181471772062363534711,00016334965981311641962292623935241,100183654721081441802162522884325761,200203959791181571962362753144716281,300214364851281702132552983405116811,400234669921371832292753213675507331,500254974981471962452953443935897852,0003365981311962623273934585247851,0472,50041821231642453274094915736549821,3093,00049981471962953934915896877851,1781,5713,500571151722293444585736878029161,3741,8334,000651311962623935246547859161,0471,5712,0944,500741472212954425897368841,0311,1781,7672,3565,000821642453274916548189821,1451,3091,9632,6185,500901802703605407209001,0801,2601,4402,1602,8806,000981962953935897859821,1781,3741,5712,3563,1426,5001062133194256388511,0641,2761,4891,7022,5533,4037,0001152293444586879161,1451,3741,6041,8332,7493,6657,5001232453684917369821,2271,4731,7181,9632,9453,9278,0001312623935247851,0471,3091,5711,8332,0943,1424,1898,5001392784175568341,1131,3911,6691,9472,2253,3384,4519,0001472954425898841,1781,4731,7672,0622,3563,5344,7129,5001553114666229331,2441,5541,8652,1762,4873,7314,97410,0001643274916549821,3091,6361,9632,2912,6183,9275,23611,0001803605407201,0801,4401,8002,1602,5202,8804,3205,76012,0001963935897851,1781,5711,9632,3562,7493,1424,7126,28313,0002134256388511,2761,7022,1272,5532,9783,4035,1056,80714,0002294586879161,3741,8332,2912,7493,2073,6655,4987,33015,0002454917369821,4731,9632,4542,9453,4363,9275,8907,854RPM to SFM Chart (Metric)Find out the SFM according to your tool’s diameter and the machines RPMRPM2 mm3 mm4 mm5 mm6 mm8 mm10 mm12 mm16 mm20 mm25 mm1002345681012162126200468101216212533415230069121519253137496277400812162125334149668210350010152126314152628210312960012192531374962749912415570014222936435872871151441808001625334149668299132165206900192837465674931111481862321,0002131415262821031241652062581,1002334455768911131361812272831,2002537496274991241481982473091,30027405467801071341612142683351,40029435872871151441732312893611,50031466277931241551862473093872,0004162821031241652062473304125152,50052771031291552062583094125156443,00062931241551862473093714956187733,500721081441802162893614335777219024,000821241652062473304124956608251,0314,500931391862322783714645577429281,1605,0001031552062583094125156188251,0311,2885,5001131702272833404545676809071,1341,4176,0001241862473093714956187429891,2371,5466,5001342012683354025366708041,0721,3401,6757,0001442162893614335777218661,1541,4431,8047,5001552323093874646187739281,2371,5461,9338,0001652473304124956608259891,3191,6492,0618,5001752633504385267018761,0511,4021,7522,1909,0001862783714645577429281,1131,4841,8552,3199,5001962943924905887839791,1751,5671,9582,44810,0002063094125156188251,0311,2371,6492,0612,57711,0002273404545676809071,1341,3611,8142,2682,83412,0002473714956187429891,2371,4841,9792,4743,09213,0002684025366708041,0721,3401,6082,1442,6803,35014,0002894335777218661,1541,4431,7322,3092,8863,60715,0003094646187739281,2371,5461,8552,4743,0923,865Related Glossary Terms:CNC MachineRPMCutting SpeedCircumference

CNC machines are programmed by the spindle speed (RPM), but cutting data is typically given in SFM. Therefore it is common that we need to compute the SFM from a given RPM to determine the cutting speed at which our cutting tool is working. It is calculated by dividing the cutter’s circumference by the cutting speed.

Read on for further information, including cutting lengths, spindle speeds, feed rates, and chip loads for drill bit sizes.

Designed with a Variable Helix ™ with an aggressive 35° Helix Angle which ends at 15°, the Impact Duty Titanium Drill bits with RED HELIX™ provide Rapid Chip ...

Look at the different drill bit sizes of carbide micro drills to determine their effective cutting length, spindle speed, feed rate and chip load.

Ideal for drilling through PCB, and printed circuit boards. Made of fibreglass, printed circuit boards require a tough micro drill, and our tungsten carbide drills range will outperform similar HSS drill bits.

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