Crop processor and a manufacturing process for a crop processor

A method of manufacturing a crop processor for cracking kernels in a forage harvester, the method comprising:

• manufacturing a first comminuting roll and a second comminuting roll;
• and
• assembling the comminuting rolls into a housing having an inlet and an outlet, the first comminuting roll and the second comminuting roll being arranged in parallel to define an opening between the first comminuting roll and the second comminuting roll,
• wherein the first comminuting roll and the second comminuting roll are configured to rotate, during use, in opposing directions to transport a flow of harvested crop, received from the inlet, through the opening towards the outlet,
• wherein the first comminuting roll is configured to rotate at a greater speed than the second comminuting roll, and wherein manufacturing the first comminuting roll and the second comminuting roll comprises:
• providing a pair of substantially cylindrical shaped rolls;
• machining a plurality of teeth in the substantially cylindrical shaped rolls, each of the plurality of teeth comprising a leading edge arranged, during use, to face in a rotation direction of the crop comminuting roll in which the plurality of teeth are machined;
• forming a hard region on the leading edge of the teeth of the second comminuting roll, the hard region having a greater hardness than the leading edge of the teeth of the first comminuting roll;
• and
• wherein the plurality of teeth of the first comminuting roll comprise a substantially flat-top edge;
• wherein the substantially flat-top edge comprises a hard region having a greater hardness than the leading edge of the teeth of the first comminuting roll.