The Jack LaLanne Power Juicer machines are an example of a centrifugal juice extractor. Centrifugal juice extractors use centrifugal force, which means moving away from the center, in combination with a high-speed spinning blade to extract the juice out of fruits and vegetables. First, produce is placed into a vertical feed chute where it drops down and comes into contact with the blade at the bottom. We then need to use a pusher to push fruits and vegetables firmly into the blade.
The blade in a centrifugal juice extractors is essential a round disc, most commonly made of stainless steel. In the disc you normally find one large blade built in and many small serrated edges constituting the rest of this disc, kind of like a cheese grater (take a look at the pic to the right).
Now, as fruits and vegetables get chopped and ground down into tiny pieces these pieces then get thrown outwards by the centrifugal force that is created by the high-speed at which the disc rotates. Completely surrounding this disc is a filter against which the pulp pieces are thrown. This force extracts additional juice upon that which is released by the cutting action of the blade. And that's the fundamental process through which a centrifugal juice extractor works.
Any given centrifugal juicer will vary in our fast it operates. The blade in a Jack LaLanne Power Juicer rotates at 3,600 RPM, while a Breville 800JEXL Juice Fountain delivers 14,000 RPM. The Breville 800JEXL is about as fast as centrifugal juicers get!