Title: Lapidary sphere grinder

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Abstract: A machine for grinding irregularly shaped rock, or various other material such as steel, wood, plastic or the like, into spherical shape; the machine including a table, upon which there is a motor driven grinding wheel and a motor driven, rubber tired wheel, the rock being maintained between a periphery of the rotating tired wheel and the grinding wheel surface, by means of a holder therebetween, that frames the rock, so it is confined to roll in the framed space, and not be able to escape therefrom, the tired wheel having an annular groove around its periphery, for seating the rock, and rolling the same, while the rubber tired wheel turns, the periphery of the rubber tired wheel, at one point, having a notch deeper than the peripheral groove, so as to interrupt the groove and, at this point, releasing the rock momentarily, so as to allow the rock to reset itself for a next rotation of the rubber tired wheel, so that, in time, the rock is rolled in all directions, and thus ground into a perfect sphere.


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