SMW Autoblok's SJL Power Chuck Grips Thin-Walled Workpieces


Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon
SMW Autoblok SJL

SMW Autoblok’s SJL six-jaw (2+2+2) equalizing and self-centering power chuck is designed to provide high accuracy with thin-walled and deformation-sensitive workpieces. The SJL can be switched from a 2+2+2 lever equalizing chuck to a classic six-jaw self-centering chuck depending on application requirements.

Utilizing the 2+2+2 lever balance capability provides high concentricity and axial runout accuracies by ensuring that the grip force of each jaw set equalizes as pairs and is in contact with the workpiece continuously. This minimizes any deformations or inaccuracies of raw materials.

The six-jaw self-centering option provides a concentric clamp locking plate for all sequential six jaws, enabling the chuck to hold round, machined diameters and thin-walled workpieces that require equal wall thicknesses. Specifically designed with centrifugal force compensation, this feature provides constant gripping force at higher speeds and feeds, vastly reducing production time, the company says.

The SJL is Proofline-sealed and protected from contamination while providing consistent lubrication for long maintenance intervals. This advanced power chuck accepts either tongue-and-groove or metric serrated top jaws and is available in sizes ranging from 225 to 400 mm.


  • Pins: The Alternative To Parallels

    These vise jaws use protruding, mechanical pins to repeatedly support workpieces either horizontally or at angles. They are said to allow quicker setups than conventional parallels.

  • Rethinking Indexers And Rotary Tables

    Affordable indexers and fourth-axis rotary tables greatly enhance the capability of vertical machining centers. It’s almost as good as having a horizontal machining center.

  • Holding Small Parts for Effective Machining on a CNC Router

    A non-woven porous material with a special coating enables vacuum chucks and tables to hold sheets of metal and other materials more effectively on CNC routing machines. The material, called Vilmill, is used as a substrate between the sheet or plate material to be machined and a suitable vacuum table or vacuum chuck where it is held securely in place by the vacuum.