The digital chucks are capable of feeling claw status and tube size and changing clamping force in self-adaptive way, which will not only clamp conventional tubes like round and square tube, but also easily process profiles incl. channel and angle steel as well as special-shaped tubes, such as, drop-shaped, C- and L-shaped tubes. Tiny tubes (Φ10mm) will remain unchanged and oversized (Φ426mm), extra-heavy (1.5t) and overlong tubes (12000mm) are clamped steadily.