Patent ID: 9486859
Filing Date: 2016-11-08
CPC Classification: B23B,B23Q,Y10T

Claim Text:
1. A drilling machine that machines a drill hole in a workpiece using a tool mounted on a main shaft, the drilling machine comprising: a pressing member that presses the surface of the workpiece to suppress the vibration of the workpiece; positioning means for positioning the main shaft so that an axial distance between the main shaft and the pressing member in a state where the workpiece is pressed, is a predetermined reference distance; measuring means for measuring the axial distance between the main shaft positioned by the positioning means and the pressing member in the state where the workpiece is pressed; position correcting means for obtaining a difference between the measurement distance measured by the measuring means and the reference distance as a correction distance, and correcting the axial position of the main shaft positioned by the positioning means, using the correction distance, to position the main shaft so that the axial distance between the main shaft and the pressing member in the state where the workpiece is pressed is the reference distance; and main shaft moving means for moving the main shaft positioned by the position correcting means in the axial direction thereof in accordance with the depth of the drill hole to perform drilling using the tool.