US Patent 7922839 Method for brake rotor assembly and manufacture

A method of assembly and manufacture of a brake rotor, comprising providing a brake rotor mold. The method also includes pouring brake rotor material into the brake rotor mold. Then the method includes rotating the brake rotor mold during hardening of the brake rotor material thereby forming a brake rotor. The method further includes removing an interior portion of the hardened brake rotor material of the brake rotor with a water jet cutting device. The water jet device shapes the brake rotor to a desired shape. The brake rotor is then heat and cryogenically treated.