| 摘要 |
PCT No. PCT/GB91/01568 Sec. 371 Date Jun. 21, 1993 Sec. 102(e) Date Jun. 21, 1993 PCT Filed Sep. 13, 1991 PCT Pub. No. WO92/05013 PCT Pub. Date Apr. 2, 1992.A polishing apparatus (10) comprises a main arm (12) mounted for horizontal and vertical movement. The arm (12) is provided with a rotating belt (32) of abrasive material for polishing purposes. An article to be polished, for example a dished end is mounted on a table drive (24). The arm (12) carries an X-Y plate (28) including a contact wheel (30) movable relative to the arm (12) along two orthogonal axes. Cylinders (38, 40) bias the contact wheel toward the article to be polished. In use, the arm (12) is swept across the radius of the dished end so as to "map" the profile to be polished and thereafter the arm (12) follows this profile at a preset "off-set" of 50-75 millimeters. Minor irregularities of the surface are "ridden" by the X-Y plate (28) against the constant bias of the pneumatic cylinder without being ground away.
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