|Driling, Countersinking and Counterboring - Course: Technique for Manual Working of Materials. Trainees' Handbook of Lessons|
By drilling, cylindrical recesses or break-throughs are cut out of workpieces.
It is necessary if
- screw joints
- pin joints
- riveted joints
- passages for fluids and gas
shall be made and if cylindrical machine parts shall be guided or carried.