Sunnen HTG series tube hones offer two-stage honing efficiency

The HTG's ID range is 2 to 24 inches (50.8 to 609.6 mm), double that of previous generation machines, with an OD capacity of 26 inches (660.4 mm) standard, and up to 48 inches (1219.2 mm) as an option. The machine is ideal for instrument piping and down hole equipment applications, such as pumps/motors and hangers, and large hydraulic cylinders like those found on offshore oil platform stabilizers. A new proportional load control hydraulic system enables maximum utilization of hydraulic power, delivering power where needed during operation for maximum efficiency. The system can deliver up to 40 hp (29.83 kW) to the spindle and up to 18 hp (13.42 kW) to the tool stroking system, for metal removal rates of 200+ in3/hr (3500 cm3/hr) using superabrasives in steel as needed. For increased speed and accuracy, the HTG uses a new precision hydraulic feed system that combines the brute force of hydraulics with the finesse of a sophisticated control. This includes servo position control of the feed system actuator, electronic pressure control, closed loop feedback, and ability to operate both standard tooling as well as two-stage tooling. The machine features a 30.48 m/min maximum stroke velocity, 0-300 revs/min spindle, and a tool feed force of up to 11,200 N. The new servo system on the feed axis provides increased accuracy, as well as improved maintenance, service and setups with no tuning required. Another upgrade is a next-generation two-stage hone head capable of roughing and finishing without changing abrasives. The two-stage hone head is available with conventional abrasives or superabrasives. The U.S.-made HTG is available in two standard model sizes – the HTG-4000 with 4m stroke length and the 10m stroke HTG-10000. Built-to-order machine sizes include 6m, 8m, 12m, 14m stroke lengths and custom-length designs can be quoted.