Use uniform in chuck body on three of the claw movable card radial move, the piece clamping and positioning of the machine tool accessories.
Three claws chuck by chuck body, claws and card claw movable card of driving mechanism. Three claws on chuck three card claw guiding parts of the thread and disc bevel gear on the back of the plane thread mesh, when using a wrench through the four square hole turning small bevel gear, gear rotating disc, on the back of the plane thread and drive three card claw to centre or exit, for the clamping different diameter workpiece. In three card claw on three on the claw, used to install the larger diameter workpiece. Three claws on the accuracy of chuck 0.05 0.15 mm. With three claws chuck the precision of the product by chuck manufacturing precision and after use the influence of the wear.