| 摘要 |
PROBLEM TO BE SOLVED: To timely and spacedly make a polishing speed uniform and to polish a free curved surface, etc., with a high accuracy by imparting a revolution motion while maintaining a directivity of a tool surface of a tool having a small diameter. SOLUTION: When a main shaft 1 is rotated, a center 13 of abrasive pad 3 is moved on a circular orbit 21 of a radius R around a revolution center 11, i.e., a rotation center of the main shaft 1. A tool surface is not rotated and a rotation position making a sub-shaft 2 as a center, i.e., a directivity is not varied. Namely, a locus of a processing point 5 caused by a revolution of abrasive pad 3 becomes a circular orbit 22. This is the same radius R as that of the circular orbit 21 of the center 13 of the abrasive pad 3 and a locus length of the processing point 5 and the center 13 is equal each other. Thus, the abrasive pad 3 is moved at the inside of a circle of a radius (R+r) making a revolution center 11 as a center, i.e., a center axis of the main shaft 1 when a radius of the tool is defined as (r). If a revolution speed during polishing step is constant, a polishing speed is timely and spacedly made uniform.
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