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Tools with bold feed column no. are preferred choice.
Pilot holes are always necessary for drilling depths over 7 x D:
1. The pilot hole can be produced with a short, rigid drill. The diameter should be
0.01 - 0.02 mm larger than the diameter of the Ratio drill. Drilling depth 1 x D.
2. Alternatively, the Ratio Drills can produce their own pilot hole. Cutting speed
and feed rate must therefore be reduced by 30-40%.
3. A coolant pressure of 40 bar is recommended.
For safety reasons it is very important, that a drill does
not exceed a speed of n = 6 000 rev./min when not supported.
The centrifugal forces could break these long tools before
reaching the workpiece surface!
Drill 1 2 3 Feed column no. 7 8 9 Cooling:
mm 456 without coolant ducts
0.004 0.006 0.007 0.014 0.016 0.019 with coolant ducts
0.50 0.006 0.008 0.012 f (mm/rev.) 0.020 0.023 0.025
1.00 0.020 0.025 0.032 0.080 0.100 0.125 Coolant:
2.00 0.025 0.032 0.040 0.008 0.010 0.012 0.100 0.125 0.160 Air
2.50 0.032 0.040 0.050 0.014 0.016 0.018 0.125 0.160 0.160 Neat oil
3.15 0.040 0.050 0.063 0.040 0.050 0.063 0.160 0.200 0.200 Soluble oil
4.00 0.040 0.050 0.063 0.050 0.063 0.080 0.160 0.200 0.250
5.00 0.050 0.063 0.080 0.063 0.080 0.100 0.200 0.250 0.315 Cutting direction:
6.30 0.063 0.080 0.100 0.080 0.100 0.125 0.250 0.315 0.315 right-hand cutting
8.00 0.080 0.100 0.125 0.080 0.100 0.125 0.315 0.400 0.400
10.00 0.080 0.100 0.125 0.100 0.125 0.160 0.315 0.400 0.500 L left-hand cutting
12.50 0.100 0.125 0.160 0.125 0.160 0.200 0.400 0.500 0.630
16.00 0.125 0.160 0.200 0.160 0.200 0.250 0.500 0.630 0.630
20.00 0.160 0.200 0.250 0.160 0.200 0.250 0.630 0.800 0.800
25.00 0.160 0.200 0.250 0.200 0.250 0.315 0.630 0.800 1.000
31.50 0.200 0.250 0.315 0.250 0.315 0.400 0.800 1.000 1.250
40.00 0.250 0.310 0.400 0.315 0.400 0.500 1.000 1.250 1.250
50.00 0.315 0.400 0.500 0.315 0.400 0.500 1.250 1.600 1.600
63.00 0.400 0.500 0.630 0.400 0.500 0.630 1.600 1.600 2.000
80.00 0.500 0.630 0.800
0.630 0.800 1.000
0.800 1.000 1.250
Material group Material examples, new description (old description in brackets) Tensile str. Hard- Cool-
Figures in bold = material no. to DIN EN MPa (N/mm2) ness ant
Common structural steels 1.0035 S185(St33),1.0486 P275N(StE285),1.0345 P235GH(H1),1.0425 P265GH(H2) 500
>500-850
1.0050 E295 (St50-2), 1.0070 E360 (St70-2), 1.8937 P500NH (WStE500)
850
Free-cutting steels 1.0718 11SMnPb30 (9SMnPb28), 1.0736 11SMn37 (9SMn36) 850-1000
1.0727 46S20 (45S20), 1.0728 (60S20), 1.0757 46SPb20 (45SPb20) 700
700-850
Unalloyed heat-treatable steels 1.0402 C22, 1.1178 C30E (Ck30) 850-1000
1.0503 C45, 1.1191 C45E (Ck45) 850-1000
1000-1200
1.0601 C60, 1.1221 C60E (Ck60) 750
850-1000
Alloyed heat-treatable steels 1.5131 50MnSi4, 1.7003 38Cr2, 1.7030 28Cr4 1000-1200
1.5710 36NiCr6, 1.7035 41Cr4, 1.7225 42CrMo4 850-1000
>1000-1200
Unalloyed case hardened steels 1.0301 (C10), 1.1121 C10E (Ck10)
850
Alloyed case hardened steels 1.7043 38Cr4 >850-1000
650-1000
1.5752 15NiCr13, 1.7131 16MnCr5, 1.7264 20CrMo5
330 HB
Nitriding steels 1.8504 34CrAl6 850
850
1.8519 31CrMoV9, 1.8550 34CrAlNi7 850
Tool steels 1.1750 C75W, 1.2067 102Cr6, 1.2307 29CrMoV9 40-48 HRC
>48-60 HRC
1.2080 X210Cr12, 1.2083 X42Cr13, 1.2419 105WCr6, 1.2767 X45NiCrMo4 1200
High speed steels 1.3243 S 6-5-2-5, 1.3343 S 6-5-2, 1.3344 S 6-5-3 240 HB
<300 HB
Spring steels 1.5026 55Si7, 1.7176 55Cr3, 1.8159 51CrV4 (51CrV4)
220 HB
Stainless steels, sulphured 1.4005 X12CrS13, 1.4104 X14CrMoS17, 1.4105 X6CrMoS17, 1.4305 X8CrNiS18-9 <300 HB
austenitic 1.4301 X5CrNi18-10 (V2A), 1.4541 X6CrNiTi18-10, 1.4571 X6CrNiMoTi 17-12-2 (V4A) 800-1000
1200-1400
martensitic 1.4057 X20CrNi 17 2 (X17CrNi16-2), 1.4122 X39CrMo17-1, 1.4521 X2CrMoTi18-2
240 HB
Hardened steels – <300 HB
350 HB
Special alloys Nimonic, Inconel, Monel, Hastelloy 850
Cast iron 0.6010 EN-GJL-100(GG10), 0.6020 EN-GJL-200(GG20) >850-1200
0.6025 EN-GJL-250(GG25), 0.6035 EN-GJL-350(GG35) 400
New ast materials CGI EN-GJV250 (GGV25), EN-GJV350 (GGV35) 450
EN-GJV400 (GGV40), EN-GJV500 (GGV50), SiMo 6 600
New cast materials ADI EN-GJS-800-8 (ADI800), EN-GJS-1000-5 (ADI1000) 600
EN-GJS-1200-2 (ADI1200), EN-GJS-1400-1 (ADI1400) 450
Spheroidal graphite iron and 0.7050 EN-GJS-500-7(GGG50), 0.8035 EN-GJMW-350-4(GTW35) 400
malleable cast iron 0.7070 EN-GJS-700-2(GGG70), 0.8170 EN-GJMB-700-2(GTS70) 600
Chilled cast iron – 600
Ti and Ti-alloys 3.7024 Ti99,5, 3.7114 TiAl5Sn2,5, 3.7124 TiCu2
3.7154 TiAl6Zr5, 3.7165 TiAl6V4, 3.7184 TiAl4Mo4Sn2,5, - TiAl8Mo1V1 600
Aluminium and Al-alloys 3.0255 Al99,5, 3.2315 AlMgSi1, 3.3515 AlMg1 >600-850
Al wrought alloys 3.0615 AlMgSiPb, 3.1325 AlCuMg1, 3.3245 AlMg3Si, 3.4365 AlZnMgCu1,5
Al cast alloys 10 % Si 3.2131 G-AlSi5Cu1, 3.2153 G-AlSi7Cu3, 3.2573 G-AlSi9 850
3.2581 G-AlSi12, 3.2583 G-AlSi12Cu, - G-AlSi12CuNiMg >850-1000
> 10 % Si 3.5200 MgMn2, 3.5812.05 G-MgAl8Zn1, 3.5612.05 G-MgAl6Zn1
Magnesium alloys 2.0070 SE-Cu, 2.1020 CuSn6, 2.1096 G-CuSn5ZnPb
Copper, low-alloyed 2.0380 CuZn39Pb2, 2.0401 CuZn39Pb3, 2.0410 CuZn43Pb2
Brass, short-chipping 2.0250 CuZn20, 2.0280 CuZn33, 2.0332 CuZn37Pb0,5
2.1090 CuSn7ZnPb, 2.1170 CuPb5Sn5, 2.1176 CuPb10Sn
long-chipping 2.0790 CuNi18Zn19Pb
Bronze, short-chipping 2.0916 CuAl5, 2.0960 CuAl9Mn, 2.1050 CuSn10
2.0980 CuAl11Ni, 2.1247 CuBe2
Bronze, long-chipping
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