| 摘要 |
A power driven abrading or polishing tool is provided that includes a motor having a rotor; a carrier part having a shaft and a key extending from the shaft; and an abrading or polishing head attached to the carrier part. The rotor includes an outer body of a first material and a core of a second material having a resistance to wear greater than the first material. The core includes an inner passage with a keyway which receives the key on the shaft of the carrier part such that a rotation of the rotor is transmitted to the carrier part and the head. In one embodiment, the rotor rotates in a housing having an inner surface with a hardness of at least approximately 80 on the Rockwell scale and/or a microfinish of 14 or better.
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