| 摘要 |
A precision abrasive finishing apparatus comprising a base, preferably of granite and being ground to true flat; an abrasive lap capable of being vacuum-clamped against said base and having an abrasive material disposed on it upper, lapping surface; and vacuum clamping means. The abrasive material may be any conventional abrasive grit, such as aluminum oxide, silicon carbide, cubic boron nitride, or other material of suitable hardness, sharpness, friability, durability, inertness, and cost, but preferably is diamond.
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