Sunnen Products — which develops and manufactures precision honing machinery for industrial and engine manufacturing operations — introduced new servomotor and drive technology to power and guide its three primary vertical honing platforms. It said the improvements bring more process capabilities, speed, accuracy, and safety to the machines. And, as a result, Sunnen’s previous model series SV-1000, SV-400 and SV-500 are being replaced with the SV-2000, SV-2400 and SV-2500 series.

The new machines feature the same outward appearance as the predecessor models, the developer noted.

The various new models have upgraded capabilities like selectable tool-feed, constant crosshatch, and faster automatic bore detection for reduced cycle times. The SV-2000 and SV-2400 machines are already in production, and the remaining SV-400 and 500 models will be replaced later this year.

The range of new machines can process bores with interior diameters from 3 mm to 300 mm, typically found in products like fuel injectors, piston pumps, gun barrels, hydraulic components, engine/compressor cylinders, diesel cylinder liners, landing gear and similar.

All of the new models include a 7.5-kW (10-hp) servo spindle, Sunnen detailed. The new SV-2000 platform offers a new choice of controlled-force or controlled-rate tool feed: controlled-rate processing allows automatic tool feed in increments as fine as 0.1 µm (0.000010 in.) Controlled-force tool feed monitors force in the tool feed system. It feeds the abrasive at the highest rate possible for part conditions, ensuring shortest cycle times and longer abrasive life.

The new SV-2400 platform now includes selectable “constant spindle load” and controlled-rate tool feed as standard.

Other new capabilities on the upgraded models include whole-bore, constant crosshatch angle. Constant crosshatch eliminates the "flattening" of the crosshatch angle at stroke-reversal points — a feature required by some engine manufacturers and MilSpec parts. The new drive technology also enables the machines to be set up to hone only on the pull stroke, or easily produce custom profiled and tapered bores.

All the new platforms include Sunnen Products’ safe-drive technology, which monitors all safety devices on the machine with a separate PLC, and stops or limits the speed of the drives if triggered.