Drilling machine

摘要

A drilling machine (1) capable of performing drilling operation at a high speed with low noise and without requiring a large thrust. The drilling machine (1) includes a main shaft (23) rotatable by an output shaft (6) of a motor, and a spindle (24) having an impact-receiving section (24B) and disposed over the main shaft (23) slidably in its axial direction and rotatable together with the rotation of the main shaft. A piston (25) is reciprocatingly slidably disposed over the main shaft (23) for impacting against the impact-receiving section (24B). A piston drive unit is disposed for driving the piston (25) with a compressed fluid. A compressed fluid supplying unit (40) is disposed for supplying the compressed fluid to the piston drive unit. A drill bit (50) is attachable to the spindle (24). When performing drilling operation, the drill bit is imparted with a combined rotational motion and the reciprocal impact motion.