Grinding machine

A grinding machine for performing a grinding process on a circumferential surface or end surface of a workpiece, the circumferential surface of the workpiece having a circular cross sectional shape;

• the grinding machine comprising:
• an upper roller and lower roller rotating in a same direction as each other in a state that the upper roller and the lower roller support the workpiece from both upper and lower sides, to rotate the workpiece;
• a shoe positioned in a vertical direction between the upper roller and the lower roller, having a tip-end surface, and supporting the workpiece from a lateral side by abutting the tip-end surface against the outer-circumferential surface of the workpiece;
• and
• a grindstone for performing the grinding process on the circumferential surface or the end surface of the workpiece,
• wherein the grinding machine further comprises:
• a vertical position adjustment mechanism for respectively changing a height position in the vertical direction of both the upper roller and the lower roller;
• and
• an angle adjustment mechanism for respectively changing an inclination angle with respect to a horizontal direction of center axes of both the upper roller and the lower roller.