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Schunk says it developed its Rota-M flex 2+2, a low-maintenance 2+2 chuck jaw, specifically for meeting the market’s increasing size and flexibility demands. The patent-pending compensating mechanism provides a compensation stroke that, depending on the model, amounts from 5.1 mm up to 10 mm per jaw — an amount Schunk says is more than provided by other available four-jaw chucks on the market. The company says this length increases flexibility for clampable workpiece geometries and opens up a wide variety of possible applications, while also saying that a single Rota-M flex 2+2 chuck will be sufficient for covering a wide range of part geometries.

According to Schunk, special seals on the guideways prevent grease from washing out under coolant pressure and gradual loss of clamping force. Even in case of low clamping forces, the company says the chuck will maintain precise functionality. At the same time, the sealings protect the chuck body against chips and dirt, increasing process safety and extending maintenance intervals. For increased safety, clamping on the Schunk Rota-M flex 2+2 operates in a self-locking manner, and indicating pins signal the clamping condition. The standard chuck sizes 260 to 1200 achieve jaw strokes from 9.5 mm to 17.8 mm and clamping forces from 100 kN to 180 kN.

As of size 800, users benefit from a weight-reduced design. The chuck face comes equipped with grooves, and fixed stops allow the chuck to double as a vise. Moreover, the large sizes are compatible with vertical lathes. The Schunk Rota-M flex 2+2 also includes a flexible serration (1.5 mm x 60° or 1/16” x 90°) to make the most of the chuck jaw’s size.