Abstract: A meat grinder comprises a perforated disc member and a coaxial knife member with a plurality of cutting blades. The members have cooperating end faces and one member is mounted on a shaft for rotation relative to the other. Each cutting blade end face defines a plurality of waste discharge grooves and each groove has an inlet point at the shearing edge of the blade and extending from the inlet point towards the entrance to a waste discharge tube. The inlet points of the grooves defined circular paths coaxial with the disc and knife members and each groove extends in a direction deviating from the circular paths.