Spindle tilting control device for a plane and spherical rotary grinding machine, fine grinding machine, lapping machine and polishing machine

Claim 1

A rotary grinding machine, comprising: (a) a machine bed with an upper horizontal part, a central vertical part, and a lower horizontal part, said central vertical part having a vertical wall; (b) a rotary table (1) disposed for rotating in the horizontal plane disposed on said lower horizontal part, including magnetic or vacuum means to retain a workpiece; (c) a vertical spindle and spindle head (3) alongside the central part of said frame disposed for holding a grindstone (2) so as to contact the workpiece which is to be placed on said rotary table, said spindle head usually rotating said grindstone in the horizontal plane, said spindle including a vertical plane section disposed parallel to said vertical wall; (d) a joint (7) for holding said spindle plane section to said vertical wall, including a cylindrical shaft section penetrating said vertical wall and a hemispherical head section penetrating said plane section, said head section allowing rotation thereabout by said spindle in universal directions of about sixty degrees; and, (e) a motor (6) connected to said upper horizontal part, operatively coupled to said spindle to rotate the spindle.