Machining with a computerized numerical cutter (CNC) is the most accurate form of fin shaping besides pre-preg high-compression moulding. CNC G10 is the preferred manufacturing method for smaller fins as the strength and toughness of G10 provides significant advantages. Because no moulds are needed, each size can have individual outlines, allowing for greater freedom in designing a fin’s plan shape. This is a key criteria for fins with a high degree of curvature along the leading and trailing edges: wave fins, freestyle fins and cross over fins.

Compared to polyester, G10 is a far superior material with greater strength and toughness. A G10 fin also provides a quicker flex response and allows the designer to use thinner sections for the same desired flex. The result is a faster fin with more responsiveness.

Drake CNC cutters include a Vertical Machine Center Takano VMC-1000 with an automated tool changer, a repeatability of 0.005mm and a resolution of 0.001mm, and a Mitsubishi Meldas 540 with 3 axis interpolation that cuts 3 axis simultaneously at a feed rate of 5000m/min to 10000m/min.