| SHARPENING FORM WITHOUT CORRECTION Normal sharpening. Application: in normal drilling in steel, non-ferrous metals, plastics. The blade edge depends on the machinability of the material. Benefits: main cutting edges of increased strength, immune to impacts and lateral forces. Simple grind, manual sharpening possible. |
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| CORRECTION TYPE ACCORDING TO DIN 1412 | |
| TYPE “A” CORRECTION Application: in ordinary drilling using drill bits with a strong core, in large-diameter drilling in solid material. Benefits: good centering when pre-drilling a starting hole by shortening the web at 1/10 of the diameter; reduced pressure and torque. |
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| TYPE “B” CORRECTION Sharpened chisel edge with corrected upper lip. Application: for drilling in high-strength steel, manganese steel with manganese content above 10%, in hard spring steel, and for enlarging holes. Benefits: immune to impacts, unilateral loads and lateral forces. |
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| TYPE “C” CORRECTION Application: for drilling with the use of drill bits with a strong core in particularly hard materials, and for drilling very deep holes. Benefits: good centering, reduced pressure. Flute division – better chip ejection. |
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| TYPE “D” CORRECTION Application: for drilling in gray iron, ductile iron and forgings. Benefits: relieves the cutting edges thanks to extended lips, immunity to impacts, good heat dissipation (increased durability). |
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| TYPE “E” CORRECTION Application: for drilling in sheet metal and soft materials, for closed-end holes with a flat bottom. Benefits: good centering, small number of splinters in pass-through drilling, accurate drilling in thin sheet metal and pipes (without hooking onto the edge). |
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