| 摘要 |
PURPOSE: To attain accurate matching to a head stock of a lathe by forming a cylindrical body serving as a guide device for a bar to be machined, by extrusion, and providing a double hydrodynamic bearing. CONSTITUTION: This device is constituted including a cylindrical body 1. This cylindrical body 1 has a length equal to the length of a bar B to be machined and includes a plurality of cylindrical spaces 2-5, and triangular spaces 6-9 are formed between these cylindrical spaces 2-5. The device further comprises a suitable means for increasing moment of inertia which results in heightening stability. Each of the cylindrical spaces 2-5 forms an oil distribution channel 11 over the whole length so as to soak the bar B while forming a dynamic bearing. The cylindrical body 1 is basically formed by extrusion as one part piece with the same length as the bar B. |
