Types of drills
Normal profile of flute, normal core, point angle 118°. Drills made of HSS Co mildly strenghtened core, point angle 130°, lead of helix 25-30°.
Profile of fluete is wide rounded with rear edges, very thick core, point angle 135°, lead of helix 35-40°.
Normal profile of flute, strenghtened core, point angle 130°, lead of helix 36°.
For machining soft materials such as aluminium and non-ferrous metals.
For machining soft materials, e.g. aluminium, non-ferrous metals, mild steel, plastics, wood, etc.