With the volt to turn the bevel gear, the bevel gear drives the plane rectangle screw thread, and then drives the three jaw to move, because the plane is smooth.
Chuck plane rectangular thread pitch is equal, so the three claw movement distances with automatic centering effect.
The three jaw chuck is composed of a large bevel gear, a bevel gear three, three claw. Three bevel gears and bevel gear meshing, the big bevel gear on the back of a plane thread structure, three claw equally installed in the plane thread.
When use spanner bevel gear, big bevel gear rotates, it in the back of the plane thread makes three claw and toward the center or near the exit.
Four claw is driven by four screw, so the four jaw chuck common no automatic centering effect. But it can be adjusted by adjusting the position of the four claws, clamping a variety of rectangular, irregular work piece.