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TWIST DRILLS 01 Overview of symbols N Helix angle: 25-30º Profile of flute: normal Core: normal Point angle: 118º TL 3000 Helix angle: 40º Profile of flute: wide with rounded rear edges Core: thick Point angle: 130º Point cut: shape C Helix angle: Profile of flute: Core: Point angle: Point cut: UTL 3000 40º wide with rounded rear edges very thick 130º shape U TURBO 36º Helix angle: Profile of flute: normal Core: thickened Centre angle: 130º Point cut: shape C UNI 40º Helix angle: Profile of flute: wide, for better chip removal Core: normal Point angle: 135º Point cut: shape C VA Helix angle: 36º Profile of flute: normal Core: thickened 130º Point angle: Point cut: shape C KV Helix angle: 25-30º Profile of flute: normal Core: normal Point angle: 130º shape C Point cut: DIN 333 Centre drills 60º shape A and R DIN 345 Twist drills with morse taper shank DIN 338 Short twist drills with straight shank DIN 1869 Extra long twist drills with straight shank DIN 340 Long twist drills with straight shank DIN 1897 Extra short twist drills with straight shank Helix angle Point angle Core 14 Profile of flute Point cut Point cuts in accordance with DIN 1412 01 N Shape N: Helical point normal ground Applications: for all normal drilling work in steel, non-ferrous metal and plastic. The point angles depend on the ease with which the materials can be cut. Advantages: powerful main cut, resistant to impact and lateral forces. Simple manual grinding possible. Disadvantages: broad cutting edge requires considerable pressure. A Shape A: Cut chisel edge Applications: for all normal drilling work using drills with a strong core, for drilling into solid materials with larger drill diameters. Advantages: good centring when starting to drill, as the length of the chisel edge is reduced to 1/10 of the drill diameter, and fewer pressure is required. Disadvantages: additional regrinding work. B Shape B: Cut chisel edge with corrected major cutting edge Applications: for drilling high-density steel, for manganese steel with over 10 % Mn, for hard spring steel and for drilling out. Advantages: resistant to impact, one-way load and lateral forces. Does not catch in thin workpieces. Disadvantages: high pressure required, tendency to slip, extra work involved in regrinding. C Shape C: Split point Applications: for drills with very strong cores, for particularly tough, hard materials and for deep-hole drills. Advantages: good centring, little pressure required. Chip spreading improves chip removal. Disadvantages: perfect grinding only possible by machine. D Shape D: Ground for grey cast iron Applications: for drilling grey cast iron, malleable cast iron and forgings. Advantages: wear on cutting corners is reduced by extended major cutting edges, resistant to impact, good heat conductivity, all giving improved tool life. Disadvantages: extra work involved in regrinding. E Shape E: Centre point Applications: for drilling sheet-metal and soft materials, for blind holes with flat bottoms. Advantages: good centring, minimal formation of burrs when through-drilling, precise drilling in thin sheets and pipes, does not catch. Available in diameters of 2.5 mm upwards. Disadvantages: sensitive to impact and one-way loading. Can only be ground to perfection by machine. Other point cuts U Shape U: Special ground Applications: for drills with sturdy profiles suitable for use in automated processing, with narrow grooves and strong cores. Advantages: extremely good self-centring behaviour when maximum cutting valuminiumes are employed. Concave cutting produces short metal chips. Disadvantages: extra work involved in regrinding. 15 VA ≥ Ø 2,0 mm HSSE Co 5 DIN 338 UTL 3000 ≥ Ø 2,0 mm HSSE Co 5 DIN 338 UTL 3000 ≥ Ø 2,0 mm HSSE Co 5 DIN 338 VA ≥ Ø 2,0 mm HSSE Co 5 DIN 338 VA ≥ Ø 2,0 mm HSSE Co 5 DIN 338 VA ≥ Ø 2,0 mm HSSE Co 5 DIN 338 UNI ≥ Ø 2,0 mm HSS-G DIN 338 TL 3000 ≥ Ø 2,0 mm HSS-G DIN 338 TL 3000 ≥ Ø 2,0 mm HSS-G DIN 338 TL 3000 ≥ Ø 2,0 mm HSS-G DIN 338 TURBO HSS-G DIN 338 N ≥ Ø 2,0 mm HSS-G DIN 338 N ≥ Ø 2,0 mm HSS-G DIN 338 N ≥ Ø 2,0 mm HSS-G DIN 338 N HSS-G DIN 338 N HSS-R DIN 338 N N HSS-R DIN 338 N N HSS-G DIN 338 N C HSSE Co 5 DIN 338 N C TC DIN 338 N C 16 130° 36° 130° 40° 130° 40° 130° 36° 130° 36° 130° 36° 135° 40° 130° 40° 130° 40° 130° 40° C U U C C C C 3 ≥ Ø 4,0 mm C C C N 3 36° C 118° 25- 30° 118° 25- 30° 118° 25- 30° 118° 25- 30° 118° 25- 30° 118° 25- 30° 118° 25- 30° 118° 25- 30° 130° 25- 30° 118° 25- 30° C C N C ≥ Ø 2,0 mm ≥ Ø 4,0 mm Page DIN 338 36° Article no. HSSE Co 8 130° C Ø mm ≥ Ø 2,0 mm Shank VA Helix angle Point cuts DIN 338 Point angle Shape HSSE Co 8 Surface DIN Range and applications overview: Material 01 1,0 - 16,0 281 010 E 281 160 E 22 - 25 1,0 - 16,0 281 010 EF 281 160 EF 22 - 25 1,0 - 16,0 229 010 229 160 26 - 29 1,0 - 16,0 229 010 F 229 160 F 26 - 29 1,0 - 20,0 215 010 215 210 30 - 31 1,0 - 14,0 215 010 Z 215 140 Z 32 - 33 1,0 - 14,0 215 010 F 215 140 F 32 - 33 1,0 - 13,0 228 010 228 130 34 - 35 1,0 - 16,0 258 010 258 160 36 - 38 1,0 - 16,0 258 010 T 258 160 T 36 - 38 1,0 - 16,0 258 010 F 258 160 F 36 - 38 1,0 - 13,0 2146 010 2146 130 39 - 40 0,3 - 20,0 214 003 214 201 41 - 44 0,3 - 16,0 214 003 S 214 160 S 41 - 44 0,3 - 16,0 250 003 T 250 160 T 41 - 44 1,0 - 13,0 214 010 Li 214 130 Li 45 1,0 - 13,0 2501 010 T 2501 130 T 46 0,3 - 20,0 201 003 201 200 48 - 49 10,5 - 25,0 200 105 200 250 50 10,5 - 20,0 200 4 105 200 4 200 50 10,5 - 20,0 200 5 105 200 5 200 50 3,0 - 13,0 814 030 814 130 51 Explanation of symbols from page 313 Steel (N/mm2) < 1100 Steel (N/mm2) < 1300 < 900 N/mm²