You don't want to overfill the food processor, so we recommend using about a cup and a half of nuts at a time (for food processors 4200xl and 5200xl).
Use the PULSE button by pushing it on and off to obtain the desired crushing consistency. If you over-process your nuts, they will heat up and release natural oils, creating a kind of nut butter.
Soft nuts such as macadamias, walnuts, pecans and pistachios are richer in natural oils and break down much more easily than hard nuts such as Brazil nuts, hazelnuts and cashews.
Ground nuts can go rancid much more easily than whole nuts, so it's best to store them in an airtight container in the fridge or freezer.
If your recipe calls for you to grind other dry ingredients with your nuts in the food processor, such as flour, spices and sugar, that's fine, but we don't recommend grinding your nuts with wet ingredients in the food processor because the nuts won't be ground evenly, and a good rule of thumb is that for every cup of nuts you grind, you'll get about 1/2 to 2/3 cup of ground nuts.