Apparatus, methods, computer programs and non-transitory computer readable storage mediums for machining objects

Apparatus for machining an object, the apparatus comprising:

• a wheel having a circumference, the wheel including:
• a first circular surface;
• a second circular surface oriented parallel to the first circular surface;
• a first rim surface extending from the first circular surface at a first edge and defining at least a part of the circumference of the wheel, a gradient of the first rim surface having a radial component;
• and
• a second rim surface extending from the second circular surface at a second edge and towards the first rim surface, the second rim surface defining at least a part of the circumference of the wheel, a gradient of the second rim surface having a radial component, the first edge defining a curved surface between the first circular surface and the first rim surface, and the second edge defining a curved surface between the second circular surface and the second rim surface.