SUPERABRASIVE TC TOOL HONES HARD-CHROME TWO-CYCLE ENGINE BORES WITH MICRON-LEVEL ACCURACY FOR HIGH PERFORMANCE

Sunnen (St. Louis, MO) is offering a TC tool that is custom engineered for honing small two-stroke cycle engine cylinders to overcome characteristic production challenges, including blind, ported and tapered bores, and hard surface coatings, such as Nikasil and chrome plating. Proven in production by major OEMs in Sunnen and other manufacturers’ machines, the TC tool easily produces fractional micron (0.000040-in) accuracies and specific surface finishes for increased power production, fuel efficiency, reduced emissions and engine durability.

Equipped with metal-bond superabrasives, TC tools use customized abrasive mounting, that holds up to a dozen stone segments of various lengths. Strategic placement of the abrasives produces superior roundness and a consistent finish from top to bottom in blind bores. Each tool is tuned to the application based on length and number of abrasives to allow the tool to bridge across ports, minimizing washout of the port edges to maintain ring seal for increased power and engine life.

Sunnen custom designs each TC tool by mapping the bore, creating a two-dimensional profile to determine optimum length and spacing of abrasives to balance tool wear and produce consistent bore geometry and dimensional accuracy over thousands of parts.

TC tools begin with hardened tool steel bodies and feed wedges and typically last up to five times longer than conventional designs, reducing per-part cost by 30 percent. Custom-engineered TC tools are capable of producing accuracies of 0.6 µm (0.000027 in) for diameter, roundness, straightness and taper. They are available for bore sizes 25 mm (1 in) and up.

TC tools are also part of Sunnen’s high-production honing system for two-cycle engine cylinders that includes the SV-1000 series machines, with options for closed-loop gauge feedback control and robotic loading/unloading from a pallet.

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www.sunnen.com