The Schunk Rota NCR-A sealed six-jaw pendulum compensation chuck has seals at the jaw interface and the piston to prevent grease from being washed out. This design also keeps the chuck from gradually losing clamping force. Even in the case of low clamping forces, the chuck is said to function precisely, while the seals block chips and dirt from entering the chuck body. As a result, the chuck requires less maintenance, meaning it doesn't have to be lubricated or cleaned as often, according to the company.
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