Sunnen’s SV-1000 vertical CNC honing machine series is based on a modular design, engineered to scale up from a single-spindle machine to a fully automated multi-spindle unit. Designed for part diameters of 3 to 65 mm, the machines can size bores with 0.25 µm accuracy. They are suited to diesel fuel injectors, gears, small engine cylinders/connecting rods, and hydraulic/pneumatic components. The single-spindle module allows for future automation with removable side enclosure panels. It is available with a fixed tooling plate or servo rotary table. Automated versions can include the servo rotary table or linear part transfer, integrated part handling systems, and up to four spindles. Innovations include a servo-controlled stroking drive that responds smoothly to motion profiles generated by the control, and a load-sensing tool feed system that senses where and how much to hone the bore.