Drilling and hole machining countersinking
2021-5-4 · Countersinking, as mentioned earlier, is used when machining previously obtained holes and end surfaces. Sweeps, as indicated in subsection. 1.1, the holes are finished. By the shape of the hole to be machined, cylindrical are distinguished (Fig.1.1, d and 1.3, c) and conical (Fig. 1.3, d) sweeps.