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United Grinding has added three radius internal cylindrical grinding machines to its Studer lineup; the S121, S131 and S141 extend part production capabilities by offering more advanced technology, a new dressing concept and larger machine size to handle a broader range of workpieces. With a workhead on a newly designed, simultaneously swiveling B axis, these three grinding machines are said to offer greater thermal stability, mechanical rigidity and interpolation from -60 to +90 degrees.

With swing diameters of 9.84" and 11.8" above the table, respectively, the S121 and S131 replace Studer’s previous CT700 and CT900 models. The S141, with a swing diameter of 15.75", extends capabilities of the product line by enabling machining of larger workpieces. The grinders can machine external diameters ranging to 6.3" with an external grinding wheel measuring 9.8" in diameter. The maximum length of parts (including clamping device) is 11.8" for all three machines, and the maximum workpiece weight (including clamping device) is 220 lbs.

The machines use Granitan machine beds to improve damping levels, thermal stability and guidance accuracy. The StuderGuide guideway and drive system with linear motors provide high wear resistance, a long working life and high dynamics, the company says. The X and Z axes are in a cross-slide arrangement. The S121’s cross-slide can take one spindle, two spindles in parallel or two spindles on a hydraulic turret; the S131 and S141’s cross-slide comes with a four-position turret with direct drive. The machines are also equipped with a dressing spindle or a fixed dresser on the B axis and a measuring probe on the grinding head.

These radius grinding machines are ideal for manufacturing dies as well as hydraulic components such as axial pump pistons, guide plates, and housings made of hardened steel, cast iron and copper. The machines can also produce complex workpieces with several tapers greater than 20 to 90 degrees in a single clamping for applications in the medical industry, such as ceramic and titanium implants.