After the cocoa beans have been broken to separate the crushed kernels known as nibs, these are conveyed to pre-grinders and fine-grinding mills, where they are crushed even more finely.
The Pre grinding is only necessary with the Ball-mill and the 2Roll refiner. If the cocoa nibs come from the winnower, they can be finely ground in the Pre-grinder. The machines grind the nibs between 120 and 50 microns. You can also grind the cocoa nibs for the stone grinder. This will save you time during the process.