The 2/3QLC from Forkardt Hardinge is the standard wedge hook power chuck series for CNC turning centers, available in both 2-jaw (2QLC) and 3-jaw (3QLC) configurations. The wedge hook mechanism converts axial draw-tube force into radial jaw clamping through a wedge-and-hook interface, providing high gripping force with backlash-free operation. An integral lubricant reserve supports extended maintenance intervals in production environments.

What distinguishes the wedge hook design from scroll-type chucks?

Unlike scroll chucks where jaw force decreases at high RPM due to centrifugal effects on the scroll mechanism, the wedge hook design transmits force through a direct wedge interface. The base 2/3QLC does not include centrifugal force compensation (available in the QLC-KS variant), but the wedge geometry inherently reduces centrifugal mass at the jaw compared to scroll-type alternatives. This makes the QLC suitable for a wider speed range than conventional power chucks.

How do I select the right size?

How does the QLC series compare across variants?

The 2/3QLC is the standard base model. The QLC-KS variant adds centrifugal force compensation for high-speed applications where jaw force must remain constant. The QLC-LS variant offers extended jaw stroke (up to 95% more) for gripping a wider diameter range without jaw changes. The QLC-KT variant uses a quick-change jaw interface (VC or KDIN mounting) for fast changeover between part families. The QLC-AG is a compensating chuck for irregular or as-cast surfaces.