Patent ID: 8777526

Claim:
A deep hole processing device for forming a hole by rotational movement of a main spindle of a portal machine toward a workpiece, wherein a tool is capable of being attached to the main spindle, the deep hole processing device comprising: a rotary joint capable of connecting the tool to the main spindle, the rotary joint being connected to a hose on an oil filler side supplying cutting oil to the tool; a bush having a cylindrical shape, and having a hole diameter for guiding rotational movement of the tool; a spindle head on which the main spindle is mounted such that the main spindle is capable of moving up and down, the main spindle being provided on a cross rail capable of moving on columns of the portal machine; a bush holding unit having a cylindrical shape and connected to the spindle head such that the bush holding unit is capable of being attached to and detached from the spindle head, the bush holding unit holding the bush at an apical end of the bush holding unit with respect to the spindle head at a distance which allows the rotary joint to move up and down without being obstructed; and a pressure sensor provided on a contacting portion of the bush with the workpiece; wherein the movement of the cross rail is controlled according to a pressure value detected by the pressure sensor.