SJL 2+2+2 Equalizing Power Chuck 

May 29, 2020
SJL 6-jaw (2+2+2) Equalizing and Self-Centering Power Chuck

SMW Autoblok, a world leader in the design and manufacture of rotational chucks, stationary workholding, tooling and custom engineered solutions for the machine tool industry, introduces the SJL 6-jaw (2+2+2) equalizing and self-centering power chuck.

Ideal for CNC machining applications, the SJL provides the highest accuracy for thin-walled and deformation-sensitive workpieces. Unique to the SJL is the ability to be switched from a 2+2+2 lever equalizing chuck to classic 6-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 equalize as pairs and are in contact with the workpiece continuously. This minimizes any deformations or inaccuracies of raw materials. 

The 6-jaw self-centering option provides a concentric clamp locking plate for all sequential six jaws allowing 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 SJL is Proofline® sealed and interior protected from contamination while providing consistent lubrication allowing for long maintenance intervals. This advanced power chuck accepts either tongue and groove or metric serrated top jaws and is available in sizes from 225-400 mm.

Related Glossary Terms

  • chuck


    Workholding device that affixes to a mill, lathe or drill-press spindle. It holds a tool or workpiece by one end, allowing it to be rotated. May also be fitted to the machine table to hold a workpiece. Two or more adjustable jaws actually hold the tool or part. May be actuated manually, pneumatically, hydraulically or electrically. See collet.

  • computer numerical control ( CNC)

    computer numerical control ( CNC)

    Microprocessor-based controller dedicated to a machine tool that permits the creation or modification of parts. Programmed numerical control activates the machine’s servos and spindle drives and controls the various machining operations. See DNC, direct numerical control; NC, numerical control.