TOOL, DEVICE, AND METHOD FOR DRILLING

摘要

A tool, a device, and a method for drilling capable of very easily forming a hole part in a drilled matter by extreme-smoothly discharging chips produced at drilled positions so as to maintain an excellent drilling efficiency, wherein, by using a drilling tool having a shaft with a spiral groove part formed in the outer peripheral surface thereof and a bit fixed to the tip part of the shaft, the hole part is formed in a drilled matter by rotating the shaft at a high speed, whereby the chips can be discharged since air flow is generated by the high speed rotation of the spiral groove part.