Alnico magnet material is made by alloying aluminum, nickel and cobalt with ron. Some grades also contain copper and/or titanium. The alloying process is casting orsintering,The process and the eat treatment needed to optimize manetic properties produces hard (RC45) and britle parts that are best shaped or finished byabrasive grinding, Cast parts are generaly under 70 pounds and may be used as-s, but polar surfaces are usualy ground flat and paralel. Sintering is confined to hievolume parts in sizes under one cubic inch and an effective press length to diameter ratio under four