How Meat Grinders Actually Crush Food
A meat grinder does not actually slice meat like a knife. Instead, it uses a horizontal screw to force food against a metal plate, effectively extruding it through tiny holes to create the desired texture.
You might assume the machine chops ingredients, but it is actually a high-pressure compression device. As the screw turns, it pushes the food firmly against stationary blades and a perforated disc. This method ensures uniform consistency far more efficiently than hand-mincing could ever achieve. It is essentially an industrial-style extruder sitting right on your kitchen counter.
Source: Meat grinder