Machining apparatus

摘要

A machining apparatus, comprising: a mounting member to be rotationally driven; a tool support member mounted on the mounting member; and a fixing member, fixed to the mounting member, for fixing the tool support member to the mounting member. The mounting member has a mounting outer peripheral surface of a generally cylindrical shape, a cylindrical mounting hole as a through-hole is formed in the tool support member, and the tool support member is mounted on the mounting member by fitting the mounting hole of the tool support member onto the mounting outer peripheral surface of the mounting member. The mounting outer peripheral surface of the mounting member has a guide region, a support region, and a relief region arranged sequentially in a central axial direction, the support region is of a cylindrical shape having an outer diameter D 1 , the outer diameter D 2 of the guide region increases up to D 1 toward the support region, and the outer diameter D 3 of the relief region progressively decreases from D 1 with increasing distance from the support region. The mounting hole of the tool support member has an inner diameter D 4 , and D 4 is larger than D 1 (D 4 >D 1 ). The length in the central axial direction of the support region of the mounting outer peripheral surface is W 1 , and W 1 is √{square root over (D 4 ²-D 1 ²)} or smaller (W 1 <=√{square root over (D 4 ²-D 1 ²)}).