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All-Digital Honing Machine Offers Servo-Precise, Digitally Repeatable Performance with Infinite Part Program Storage

Sunnen's new SH-4000 power-stroked honing machine merges a Siemens touchscreen PLC and digital-servo drives with a patent pending servo-hybrid tool feed system, extreme repeatability, and clear adjustable guard/light curtain for faster, operator-friendly setups.

The SH-4000, engineered as an easy-to-use flexible hone for medium to high production of parts with bore diameters from 1.5 to 101.6 mm (0.060" -- 4.0"), will be demonstrated at Westec 2015 in Los Angeles. It is capable of processing a wide variety of part sizes and configurations, and cutting all kinds of materials quickly and efficiently. It features a 4.1-kW (5 hp) spindle drive and 1.1-kW (1.5 hp) stroker drive, with stroke travel up to 392 mm (15.43 in). Spindle speed is infinitely adjustable from 200 to 3,000 rpm, with stroke rates of 10 to 550 SPM.

With 45 percent fewer parts and greater reliability than predecessor models, the SH-4000 introduces patent-pending digital-servo tool feed and cutting pressure control for consistent, predictable performance throughout the pressure range. Cutting pressure can be adjusted in 4.5 N (1 lbf) increments to a new maximum of 2,224 N (500 lbf) -- double the maximum of earlier models.

The digital system provides superior feed control at low pressures for improved honing results with small-diameter parts. The higher cutting pressure, plus two-step honing capability, ensures short cycle times. Two-step honing allows high stock removal coupled with a precise finish step, all in one operation. In addition, the new tool feed system includes 20 mm (0.79") additional travel for increased diameter range when using high-production MMT tooling.

The new servo ballscrew stroker delivers extreme precision and repeatability for honing in blind bores, while a longer stroke length of 392 mm (15.43") allows the new machine to take on deeper bores. For fastest setup, the machine's stroking system can be controlled with a joystick on the operator station.

A new true-running spindle with direct collet connection allows quick setup or changeover with MMT tooling and the quick-setting runout-adjustable adapter allows installation of standard Sunnen tooling, such as K mandrels. Side access to the workzone enhances operator ergonomics during setup and facilitates integration with part-handling automation.

Standard control features include saved setups, zero shutoff, stone wear compensation, feed speed regulation (stone saver), two-step feed, spindle reverse, speed changes while in cycle, inch/metric selectable units, system diagnostics, cycle dwell, in-process short stroking and 13 operator languages.

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