| 摘要 |
A self-centring mill (1), particularly for threaded holes, comprising a centring device (10) which is insertable in a threaded hole (100) provided in a surface to be cut (110) and is associable with a cylindrical hollow end mill (20) to cut the surface that is adjacent to the threaded hole (100) along a cutting plane which is substantially perpendicular to the axis (101) of the threaded hole (100). The centring device (10) comprises a hollow expandable sleeve (40) insertable with play in said threaded hole (100) and provided with a threaded outer surface (42) adapted to engage the thread of said threaded hole (100) once it has expanded. |
