SPINDLE DEVICE OF MACHINE TOOL

摘要

A spindle device of a machine tool stably spouting spray coolant from the tip of a tool (26) in a tool holder (25) and suppressing a waste of the spray coolant, wherein the tool holder (25) is fixed to the tip part of a spindle (2) mechanically detachably through clamp means (KR), an extension passage (101) is formed in the state that an in-spindle spray coolant passage (100) formed in the center part of the spindle (2) is extended forward (f2), and the in-spindle spray coolant passage (100) is formed to communicate with an in-holder spray coolant passage (102) formed in the center part of the tool holder (25) through the extension passage (101).