| 摘要 |
A ball bearing lapping machine was comprised of members with relatively rotatable concentric conical portions, one of the conical portions provided with a spiral groove(33), and a ball feed device for depositing the ball bearings to be lapped at the top of the mambers. An outer ring mamber(18) having an inner conical surface(19) of the same cone angle as that of conical member(10), surrounded the latter and was held against rotation but was movable axially, thus providing for approach of the inner conical surface(19).
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