| 摘要 |
PURPOSE:To attain dynamic balancing of a magnetic disc pack rotating body simply in a short time with high precision, by holding plural steel balls so as to be moved in a ring shaped groove formed with an inner and an outer wheels having a metallic ball guide orbit. CONSTITUTION:In dynamically balancing the magnetic disc pack, first a magnetic disc pack assembly is fitted to a dynamic balancing machine. In this state, a plurality of steel balls 6 are freely moved in the ring shaped groove 29 formed with an inner and outer wheel 4 of the ring shaped steel guide orbit made of a shape storage alloy and a ring shaped steel ball guide orbit 5. In rotating the magnetic disc pack to attain dynamic balance, plural steel balls 6 is moved to a position to cancel unbalanced mass of the magnetic disc pack. In this state, the outer wheel 4 of the guide orbit is expanded in blowing cold air or carbon dioxide to the outer wheel 4 of the guide orbit of the steel balls made of the ring shaped storage alloy, plural steel balls 6 are fixed and the mass of the rotating body is balanced. |
