Sunnen Product Co.'s new HTD tube hone delivers a 16m (52') stroke, and handles parts up to 1,000mm (39") in diameter. An electronically controlled, 30-kW (40.23-hp) spindle motor powers stock removal of 2,500 cm3/hr. (150 in3/hr.) for fast, accurate honing of helicopter driveshafts, marine driveshafts, submarine periscopes, downhole oil drilling components, cannon barrels, bimetallic tubes and hydraulic cylinders. The machine corrects bore geometry and size errors, as well as product-specific surface finishes and crosshatch angles to ensure correct sliding/sealing surfaces between mating parts. The HTD uses an operator-friendly Windows-based controller for optimal control of bore geometry with functions for stroke position, motion, stone feed and cutting pressure. The HTD is particularly suited for controlling taper variation and drift in long bores, using Sunnen's double- and triple-banked tools. Available abrasives include aluminum oxide, silicon carbide, CBN and diamond honing stones Six-tube hone models from Sunnen can do light-duty repair and resurfacing work to high-power, high-metal-removal applications on long, large parts. These machines handle bore diameters from 3mm to 1,000mm, with stroke lengths of 2m to 14.5m, providing stock-removal rates of 130 cc/hr. to 2,500cc/hr.