In order to find a solution to heat cracking and other similar factors which cannot be avoided when performing additional hole-drilling machining on the conventional mass-production components. The Spoon staff took part in the full range of activities from the design stage, ultimately developing a flap-type, cast-metal brake rotor. In addition to achieving the ideal degree of strength, it was also possible to obtain a product with the required levels of parallelism and perpendicularity. By evenly distributing the ideal carbon content throughout the material, it has been possible to restrict the range of specific-gravity values and to suppress differences between individual rotors to a specific level. Precision positioning has been implemented with respect to the placement of die cores for casting holes, thus allowing remarkable degrees of strength and cooling performance to be achieved.
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