This places particularly high demands on the drilling tools. The clamping conditions on these machines are usually unstable. Steel beams are usually prepared for assembly on special drilling/sawing machines.

This grinding is used for thin-walled workpieces, sheets and soft materials. This geometry offers excellent centring properties and an accurate bore with low burr formation. With form E, a so-called centring point is ground.

This grinding is mainly used in metal processing for grey cast iron, malleable iron and forgings. This makes the tool less sensitive to shocks and increases its tool life. It removes the cutting corner, creating two new, less sharp cutting corners. Form D is a combination of form A and an additional point angle, which is usually 90°. This means that the split point grinding can be used to create more precise hole diameters and a perfect round hole. This ensures excellent centring properties and lower feed forces. In this type of grinding, two surfaces are ground to each other so that they cross in the area of the transverse cutting edge. Chip packages form on the corrected surface, which are broken and transported away via the flutes.įorm C corresponds to split point grinding. This increases resistance to chips when drilling into solid material. The positive rake angle is corrected and the cutting wedge is ground “blunt”. It is a combination of form A and a main cutting edge correction. This means that the transverse cutting edge is reduced at defined angles in additional operation with a grinding disc.įorm B is suitable for long-chipping materials such as structural steel and high-strength steel.

With form A, the transverse cutting edge is sharpened to reduce the axial forces. The enormous range of materials to be machined requires a wide variety of point grinds.

Carbide step drill bit