HOME→Products→NEOMET-INSERT DRILL Neomet-Inset Drill employs SHOWA original Neomet-Insert, which is made of new extra hard material having hardness near to tungsten carbide and toughness exceeding to HSS. One drill holder accommodates a range of insert diameters. Hole sizes 9.7mm – 55mm can be accommodated with ten standard holders only, as deep as 5 to 7 times the diameter. The replaceable insert can be changed quickly and accurately ensuring repeated linear/radial accuracy, eliminating the need for resetting. Neomet-Insert T/C Insert THROUGH DRILL COOLANT SUPPLY Provides excellent cutting performance and optimum tool life. SET SCREW The insert is fixed firmly by two set screws. UNIQUE THINNING Reducing thrust force drastically. WIDE FLUTE The latest flute configuration is employed for efficient chip removal. INSERT SEAT Linear height is kept constant by the seat. CENTER PIN Radial balance is held by the center pin. REPLACEABLE INSERTS Neomet-Insert dramatically increases cutting speed and feed rate. (T/C inserts are also available for 10mm to 35mm diameters.) Neomet-Insert drill can be used in either a static mode (fixed to turn in a lathe) or a dynamic mode (rotating as in machining center). Cutting conditions differ according to machine power and rigidity and workpiece conditions. The most suitable condition should be selected referring to the guide numbers in the table shown-below. These cutting conditions are subject to through the tool coolant supply. Otherwise, cutting speed should be reduced by 40 to 50%, and the hole depth should be less than 3 times the diameter. Requirements for optimum drill performance Preparations The machine, spindle and workpiece clamping should be rigid to ensure an efficient drilling and long tool life. In case of through holes, insufficient rigidity leads to vibrations or 'sagging' of the drill when the drill emerges from the workpiece. Coolant Coolant pressure and coolant flow must be maintained at the optimum rate for the drill size in use. See graph below. Failure to do this will lead to poor surface finish or even tool breakage. The size of solid particles in the coolant fluid should not exceed 50 micron. Ensure machine coolant filtration complies. Neomet-Insert T/C Insert Cautions Pre-drilled or pre-cast holes can not be drilled out. (FIG.1) Do not use the drill for interrupted cuts, such as drilling cross holes. (FIG.2) Tool life and finish will be improved by the following way. To pre-center up to the drilling diamter with the point angle same to the drill's. (FIG.3) To start drilling at a reduced feed rate with a rated rotation. To reduce the feed rate again just before the drill goes out from the other end. Sufficient coolant should be supplied through the drill. If coolant is supplied from the outside, reduce the speed by 40 to 50%. The hole depth in this case should be less than 3 times diameter. It is recommended to replace the insert before it is completely worn out. Cutting conditions Neomet Insert Speed : m/min, Rotation : RPM, Feed : mm/rev Material DIN / BS / JIS Hardness (HB) Speed (m/min) Dia. φ10 φ12 φ16 φ20 φ25 φ30 φ40 φ50 S50C Carbon steel C=0.5% 179–235 50–70 RPM 2220 1850 1390 1100 890 740 550 440 Feed 0.11 0.14 0.19 0.25 0.31 0.34 0.36 0.38 S55C Carbon steel C=0.55% 183–225 40–65 RPM 2070 1720 1290 1030 830 690 520 410 Feed 0.11 0.14 0.19 0.25 0.31 0.34 0.35 0.38 SCM415 Chromoly C=0.15% 235–321 50–70 RPM 2220 1850 1390 1100 890 740 550 440 Feed 0.11 0.14 0.19 0.25 0.31 0.34 0.36 0.38 SCM440 Chromoly C=0.4% 285–341 30–40 RPM 1240 1030 774 620 500 410 310 240 Feed 0.06 0.07 0.1 0.15 0.16 0.17 0.18 0.19 SS41 Structural steel - 40–65 RPM 2070 1720 1290 1030 830 690 520 410 Feed 0.11 0.14 0.19 0.29 0.31 0.34 0.36 0.38 SUS304 Stainless steel 187 Less 25–35 RPM 955 800 600 480 380 320 240 190 Feed 0.05 0.07 0.1 0.16 0.18 0.2 0.2 0.22 SKD11 Die steel Cr=12% 255 Less 18–26 RPM 830 690 520 410 330 270 210 160 Feed 0.06 0.08 0.11 0.17 0.18 0.2 0.21 0.22 FC20 Cast iron 217 Less 60–80 RPM 2480 2060 1550 1230 1000 830 620 490 Feed 0.11 0.14 0.19 0.29 0.31 0.34 0.36 0.38 FCD45 Forgible cast iron 143–217 60–80 RPM 2480 2060 1550 1230 1000 830 620 490 Feed 0.09 0.12 0.16 0.25 0.26 0.29 0.3 0.32 Al5056 Aluminum - 120–150 RPM 4460 3720 2790 2230 1780 1490 1110 890 Feed 0.14 0.18 0.21 0.36 0.39 0.43 0.45 0.48 T/C Insert (φ10–φ25) Material DIN / BS / NF / ISO Speed (m/min) Feed (mm/rev) Non alloy steel < 700 N/mm2 CK45 / 060A45 / XC45 60–120 0.1–0.25 Alloy steel < 800 N/mm2 / 708M15 / 15CD4 60–120 0.1–0.2 Tool steel < 1000 N/mm2 105WCr6 / 105WC13 40–80 0.08–0.2 Die steel > 1000 N/mm2 X5CrNi1810 / 304S31 / 30–50 0.05–0.15 Cast steel Medium hardness / A1 / SC42 40–80 0.1–0.3 Cast steel > 700 N/mm2 / / SCW63 25–50 0.08–0.2 Cast iron > 250 HB / 260 / Ft20D 50–100 0.1–0.3 Forgible cast iron > 350 HB GGG45 / 450-7 / FG500-7 40–80 0.08–0.2 PDF version of this page DIMENSIONS Cutting Tool P.127–129         To SHOWA Products page