Grinding machine and method of operating a grinding machine

A grinding machine (1), comprising:

• a machine bed (10);
• a workpiece spindle (20) arranged on the machine bed (10), the workpiece spindle (20) having a workpiece holder (21);
• and
• a tool spindle (40) arranged on the machine bed (10), the tool spindle (40) having a tool holder,
• wherein the workpiece spindle (20), the workpiece holder (21), the tool spindle (40) and the tool holder are each configured such that a workpiece held in the workpiece spindle (20), relative to a tool (41) held in the tool holder (40), is displaceable along an X-axis, the X-axis extending in a first direction parallel to a surface of the machine bed (10), the workpiece being displaceable along the X-axis by displacement of a T-slot table (22), the workpiece spindle (20) being carried by the T-slot table (22),
• wherein the workpiece spindle (20), the workpiece holder (21), the tool spindle (40) and the tool holder are each further configured such that the workpiece held in the workpiece spindle (20), relative to the tool (41) held in the tool holder (40), is displaceable along a Y-axis, the Y-axis extending in a second direction parallel to the surface of the machine bed (10), the tool (41) being displaceable along the Y-axis by displacement of the tool spindle (40) carried by a carriage (43),
• wherein the workpiece spindle (20), the workpiece holder (21), the tool spindle (40) and the tool holder are each further configured such that the workpiece held in the workpiece spindle (20), relative to the tool (41) held in the tool holder (40), is displaceable along a Z-axis, the Z-axis extending perpendicular to the surface of the machine bed (10), the tool (41) being displaceable along the Z-axis by displacement of the tool spindle (40) carried by a carriage (42),
• wherein the workpiece spindle (20), the workpiece holder (21), the tool spindle (40) and the tool holder are each further configured such that the workpiece held in the workpiece spindle (20), relative to the tool (41) held in the tool holder (40), is rotatable about an A-axis, the A-axis extending parallel to the surface of the machine bed (10), the workpiece spindle (20) rotating the workpiece about the A-axis,
• wherein the workpiece spindle (20), the workpiece holder (21), the tool spindle (40) and the tool holder are each further configured such that the workpiece held in the workpiece spindle (20), relative to the tool (41) held in the tool holder (40), is rotatable about a C-axis, the C-axis extending perpendicular to the surface of the machine bed (10), the workpiece spindle (20) being rotated about the C-axis by a carriage (23),
• wherein the tool spindle (40) is kinematically separated from the workpiece spindle (20), with movements along the X-axis, about the A-axis and about the C-axis being carried out by the workpiece spindle (20), and movements along the Y-axis and along the Z-axis being carried out by the tool spindle (40).