| 摘要 |
A fine-grinding machine has a stationary stand on which a workpiece is fixed and which has a vertically adjustable arm carrying a tube defining a tube axis and displaceable angularly and axially on the arm relative to its axis. A tool mount adapted to hold a fine-grinding tool and having a tool axis generally parallel to the tube axis is mounted on the tube for displacement along a diameter through the tube axis. The tube can be set at any angular position for adjustment of the diametrical direction of displacement of this tool mount. A central shaft angularly and axially displaceable in the tube has an inclined pin at one end engaging the tool mount so that the axial position of the tube determines the eccentricity of the tool axis relative to the tube axis. Rotation of this central shaft therefore will reciprocate the tool mount diametrically of the tube to an extent determined by this eccentricity. Finally the entire tube, mount, and shaft can be vertically reciprocated to finish the upright inner side walls of the recess in a workpiece.
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