News | July 24, 2020

6-Jaw Power Lathe Chuck – Sealed For Long Maintenance Intervals

Special seals at the jaw interface and piston avoid the grease of the sealed 6-jaw pendulum compensation chuck SCHUNK ROTA NCR-A of being washed out and prevent the clamping force from being gradually lost. Even in the case of low clamping forces, the precise functioning of the chuck is ensured. At the same time the seal ensures that an ingress of chips nor the dirt into the chuck body is avoided. This increases process reliability and extends maintenance intervals. This means that the lathe chuck doesn't have to be lubricated or cleaned as often.

Maximum roundness of deformation-sensitive parts
The SCHUNK ROTA NCR-A consists of a central chuck piston carrying three inner pendulums aligned at 120°. Each pendulum is connected to two base jaws. This ensures workpiece centering between six contact points, which can be adjusted in pairs. As the clamping forces are directed towards the chuck center, optimum centering is achieved without redundant dimensioning of the workpiece. The chuck perfectly adjusts itself to the workpiece with its oscillating jaws. In case of a conventional jaw clamping, this configuration ensures maximum roundness of the workpieces. Compared to the 3-jaw chuck clamping, deformation of ring-shaped workpieces reduces by a factor of 10. For finish machining or clamping of rough turned surfaces, users can clamp the pendulums of the ROTA NCR-A chuck in center position, and all six jaws can move concentrically. The clamping force between the first and second clamping process can be reduced by means of a pressure valve at the hydraulic cylinder. The rigid chuck body and the long jaw guidances ensure a high repeat accuracy and precise results.

Low height and large selection of standard jaws
Due to the flat chuck design, there is plenty of space in your machine room for the workpiece and the machining process. Instead of using costly system jaws or special solutions, standard jaws from the world's largest chuck jaw range from SCHUNK can be used on the jaw interface of the ROTA NCR-A. This saves cost and time-consuming special designs, increases flexibility, and lowers the set-up effort. The SCHUNK ROTA NCR-A is available in sizes from Ø 190 mm to Ø 1,000 mm with maximum clamping forces from 36 kN to 300 kN, and jaw strokes from 6 mm to 25 mm. In sizes 190 to 225, the power lathe chuck is equipped with tongue and groove, and from size 250 with a flexibly useable fine serration (1.5 mm x 60° or 1/16'' x 90°). From size 630, the lathe chucks are also prepared for use on vertical lathes. Depending on the size, the pendulum compensation amounts between ±1 mm and ±6 mm. The maximum speed of rotation is 600 RPM to 4,000 RPM.

Source: SCHUNK GmbH & Co. KG