Technical Information - Endmill Operating Data CUTTING TOOLS ENDMILL OPERATING DATA Endmill Selection · The more flutes on the endmill will usually improve the surface finish of the part. If workpiece finish is important, select four or more flutes. · Fewer flutes permit greater chip carrying capacity. · Always select the largest diameter endmill for the cut being made. This helps to keep deflection to a minimum, and decreases the chip load. · Keep tool overhang to a minimum, always insert the shank as far as possible into the holder. Collect holders are preferred set up. Coolant · Light cutting oil or water-soluble oil may extend tool life and improve surfaces finishes. · If coolant is used, you must maintain a heavy flood directed on the cutting edge. This minimizes the chance of intermitting cooling, which can cause thermal cracking of the carbide. · A heavy flow of coolant or a strong air blast is necessary when machining aluminum. · Stainless steels require a coolant, which is high in coolant action but low in lubricating qualities. Note: Many operations can be run dry with a blast of air to remove chips. Speed and Feeds: · Proper speeds and feeds will help eliminate chatter and excessive heating of the tool. · Refer to the chart below for suggested speeds and feeds for various materials. · Speed ranges are dependent on the machinability of the material. · For slotting applications the speed of the cutter should be reduced 20-30%. · Long flute length tools reduce the feed per tooth 50% and speed 20%. · Roughing endmills should increase feed per tooth 50%-100%. · Depths of cut are not to exceed 1-1/2 times the cutter diameter. · As radial and axial depth of cut increase, chip load should decrease. FEED PER TOOTH BY SIZE MATERIAL NON-FERROUS MATERIALS Aluminum/Aluminum Alloys Brass/Soft Bronze Copper/Copper Alloys Magnesium/Magnesium Alloys PLASTICS Plastics Glass Filled (Acrylics, Phenolics) CAST IRON Ductile Iron Gray Cast Iron Malleable Cast Iron HIGH TEMPERATURE ALLOYS Nickel Base Monel/High Nickel Steel STAINLESS STEEL Austenitic (300 series) Martensitic (400 series) STEELS Low Carbon (10xx, 11xx, 13xx) Medium Carbon (200, 250, 300) HighStrengthSteels (4340,6150,H-11, H-13) TITANIUM ALLOYS Titanium Alloys (soft) Titanium Alloys (hard) SPEED SFM 800-2000 300-900 600-1000 1000(min.) 600-1100 650-600 100-400 450-600 150-500 45-125 60-150 100-350 80-200 250-500 125-400 50-200 90-130 50-170 1/8 0.0005 0.0010 0.0010 0.0010 0.0015 0.0015 0.0005 0.0010 0.0005 0.0004 0.0005 0.0003 0.0002 0.0005 0.0005 0.0002 0.0005 0.0003 1/4 0.0020 0.0020 0.0020 0.0020 0.0030 0.0030 0.0010 0.0020 0.0010 0.0008 0.0010 0.0010 0.0005 0.0015 0.0010 0.0005 0.0005 0.0003 3/8 0.0030 0.0030 0.0025 0.0030 0.0040 0.0035 0.0015 0.0030 0.0020 0.0010 0.0015 0.0010 0.0006 0.0020 0.0015 0.0010 0.0015 0.0010 1/2 0.0040 0.0040 0.0030 0.0040 0.0060 0.0040 0.0020 0.0040 0.0030 0.0010 0.0020 0.0010 0.0007 0.0030 0.0025 0.0010 0.0020 0.0015 3/4 0.0060 0.0040 0.0040 0.0060 0.0100 0.0600 0.0040 0.0050 0.0050 0.0010 0.0030 0.0025 0.0015 0.0050 0.0040 0.0020 0.0030 0.0020 1 0.0080 0.0050 0.0050 0.0100 0.1500 0.1200 0.0060 0.0070 0.0070 0.0020 0.0040 0.0040 0.0030 0.0060 0.0050 0.0030 0.0040 0.0030 COATING APPLICATIONS 1st CHOICE 2nd CHOICE TiCN TiCN TiCN TiCN TiCN TiCN TiALN TiALN TiALN TiALN TiALN TiCN TiALN TiCN TiCN TiCN TiALN TiALN TiCN TiCN TiCN TiCN TiCN TiN TiCN TiN TiN TiN TiCN TiCN NOTE: These are suggested starting points only. Use low end recommendations to start and adjust your SFM by chip color. Chips should be tan, if white increase your speed. If blue and dark, lower your speed. Light cuts at higher speed will improve the surface finish. * Not responsible for typographical errors. SUPPLIES & SOLUTIONS FOR AMERICA'S WORKPLACE www.erindustrial.com 155 

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