Sunnen Products’ new SV-490 hone brings true 90-inch (2286 mm) vertical stroke and end-to-end dwelling capabilities to the machining of bores up to 8 inches (200 mm) diameter on large aerospace, energy and hydraulic components. The machine is equipped with a 7.5 kW (10 hp) 5-500 rpm variable speed spindle and a 7.5 kW (10 hp) 1-130 strokes-per-minute DC stroker, capable of producing 3000-lbs (1360 kg) thrust. The servo-controlled rotary tool feed system produces 225 lbf-in (25.4 Nm) of torque for fast, accurate machining with diamond and superabrasive tools. The feed system can be optimized for each application by either operating as a rate system or feeding to a constant spindle load. This capability, coupled with the standard features such as sizing, sparkout, crosshatch, and two-stage honing allows users to tailor machine operations to the tooling/abrasive combination best suited to the application. These features compensate for part variation and allow the SV-490 to produce more consistent surface finishes with better tool life and optimized cycle time.