PilotPrecision.com | 413-350-5200 magafor 121 Performance Recommendations Endmills with long neck, extra-long neck, and deep machining: Reduce the speed, while maintaining the suggested feed. Superficial work: Increase the speed, while maintaining the suggested feed. This chart lists general reference parameters for a starting point. SFM: Surface Feet per Minute RPM: Revolutions per Minute IPT: Inches per Tooth (chip load) IPM: Inches per Minute IPR: Inches per Revolution Material Diameter (inch - mm) Speed SFM RPM IPT 2 Flute IPM Speed SFM RPM IPT 2 flute IPM Chromium / Cobalt 0.0197 - 0.5 82 15,900 – 28,504 0.0004 13 – 23 164 31,000 – 38,200 0.0004 25 – 30 0.0394 - 1.0 ~ 7,950 – 14,252 0.0006 9.5 – 17 ~ 15,900 – 19,100 0.0006 19 – 23 0.0787 - 2.0 147 3,980 – 7,135 0.0012 9.5 – 17 197 7,960 – 9,562 0.0012 19 – 23 0.1575 - 4.0 1,989 – 3,565 0.0023 9 – 16 3,978 – 4,778 0.0023 18 – 22 Graphite, Plastic w/glass or carbon fibers 0.0197 - 0.5 197 38,200 – 57,203 0.0004 30 – 46 656 127,204 – 159,005 0.0004 102 - 127 0.0394 - 1.0 ~ 19,100 – 28,602 0.0006 23 – 34 ~ 63,602 – 79,502 0.0006 76 – 95 0.0787 - 2.0 295 9,562 – 14,189 0.0012 23 – 34 820 31,841 – 39,802 0.0012 76 – 95 0.1575 - 4.0 4,778 – 7,155 0.0023 22 – 33 15,911 – 19,888 0.0023 73 - 91 Steel 24 ~ 44 HrC 0.0394 - 1.0 ~ 12,700 – 15,900 0.0003 7.5 - 9.5 0.0787 - 2.0 164 6,359 – 7,960 0.0007 9-11 0.1575 - 4.0 3,177 – 3,978 0.0014 9-11 Treated Steel 45 ~ 55 HrC 0.0197 - 0.5 98 19,003 – 22,300 0.0001 3.8 - 4.5 0.0394 - 1.0 ~ 9,502 – 11,150 0.0002 3.8 - 4.5 0.0787 - 2.0 115 4,757 – 5,582 0.0004 3.8 - 4.5 0.1575 - 4.0 2,377 – 2,789 0.0008 3.8 - 4.5 Treated Steel > 55 HrC 0.0197 - 0.5 49 9,502 – 11,798 0.00006 1.1 - 1.4 0.0394 - 1.0 ~ 4,750 – 6,399 0.00015 1.4 - 1.9 0.0787 - 2.0 66 2,378 – 3,204 0.00024 1.1 - 1.5 0.1575 - 4.0 1,188 – 1,600 0.00055 1.3 - 1.8 Stainless Steel 0.0197 - 0.5 131 25,400 – 31,000 0.0002 10 – 12 0.0394 - 1.0 ~ 12,700 – 15,900 0.0004 10 – 13 0.0787 - 2.0 164 6,359 – 7,960 0.0008 10 – 13 0.1575 - 4.0 3,177 – 3,978 0.0019 12 – 15 Super alloys Inconel / Waspaloy 0.0197 - 0.5 59 11,440 – 15,900 0.00004 1 – 1.3 0.0394 - 1.0 ~ 5,720 – 7,950 0.00012 1.4 - 1.9 0.0787 - 2.0 82 2,864 – 3,980 0.00016 1 – 1.3 0.1575 - 4.0 1,431 – 1,989 0.00032 1 – 1.3 Titanium / Ti-alloy 0.0197 - 0.5 65 12,604 – 19,003 0.00008 2 – 3 0.0394 - 1.0 ~ 6,302 – 9,502 0.00024 3 – 4.5 0.0787 - 2.0 98 3,155 – 4,757 0.00032 2 – 3 0.1575 - 4.0 1,577 – 2,377 0.00059 1.9 - 2.8 Ceramics 0.0197 - 0.5 229 44,405 – 57,203 0.0004 35 – 46 0.0394 - 1.0 ~ 22,203 – 28,602 0.0008 35 – 46 0.0787 - 2.0 295 11,115 – 14,189 0.0016 35 – 45 0.1575 - 4.0 5,554 – 7,155 0.0031 34 - 44 Aluminum other plastics 0.0197 - 0.5 328 63,602 – 95,403 0.0004 51 – 76 0.0394 - 1.0 ~ 31,801 – 47,702 0.0006 38 – 57 0.0787 - 2.0 492 15,920 – 23,881 0.0012 38 – 57 0.1575 - 4.0 7,955 – 11,933 0.0023 36 - 55 Copper / Brass / Bronze 0.0197 - 0.5 164 31,000 – 50,804 0.0004 25 – 41 0.0394 - 1.0 ~ 15,900 – 25,402 0.0006 19 – 30 0.0787 - 2.0 262 7,960 – 12,717 0.0012 19 – 30 0.1575 - 4.0 3,978 – 6,355 0.0023 18 - 29 Speed Formula: RPM = 3.82 x (SFM ÷ Diameter) Feed: IPM = IPT x # of Flutes x RPM IPR = IPM ÷ RPM SFM = RPM x Diameter ÷ 3.82 Hard Hard'X'X Graph Graph'X'X
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